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1. Back Cover

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

2. Index

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

3. 5. The Composer as Conductor and Composer

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

4. Postlude: Extensions of the Tradition—Linkages and Canon

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

5. 6. Generation X and Beyond (1950-1965)

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

6. About the Author

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

7. 1. Laying the Foundations

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

8. 3. The Arrived and the Acknowledged, Part 2 (1937-1945)

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

9. 4. Perspectives on Spirituality, Jazz, and Contemporary Popular Languages

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

10. Acknowledgments

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

11. 2. The Arrived and the Acknowledged, Part 1 (1922-1936)

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

12. Foreword

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

13. Preface: Black Beethovens

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

14. Copyright Page

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

15. Dedication

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

16. In Loving Memory

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

17. Title Page

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

18. Table of Contents

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

19. Cover

Author

Woods, Michael, Wilson, Olly, Williams, Tony, Williams, Julius, Williams, James Kimo, Walker, George, Tillis, Frederick C, Taylor, Billy, Smith, Hale, Simpson-Curenton, Evelyn, Scott, Kevin, Russell, George, Rushen, Patrice, Powell, Michael, Perkinson, Coleridge-Taylor, Newby, Stephen, Nash, Gary Powell, Mumford, Jeffrey, Moore, Dorothy Rudd, McFerrin, Bobby, Logan, Wendell, Kelley, Anthony, Holland, Jonathan, Hancock, Herbie, Hairston, Jester, Hailstork, Adolphus, Fox, Donal, Dunner, Leslie, Duke, George, Davis, Anthony, DaCosta, Noel, Childs, Billy, Barnwell, Ysaye Maria, Banfield, William C., Baker, David, Baiocchi, Regina Harris, Andrews, Dwight, Anderson, Thomas J, Alston, Lettie Beckon, Adams, H. Leslie, and Abels, Michael

Published
2023

20. Sachs equations and plane waves III: Microcosms

Author

Holland, Jonathan and Sparling, George

Subjects
Mathematical Physics, General Relativity and Quantum Cosmology, 83C35
Abstract

This article examines the structure of plane wave spacetimes (of signature $(1,n+1)$, $n\ge 2$) that are homogeneous (the isometry group is transitive) and geodesically complete -- which we call microcosms. In general, a plane wave is shown to determine a smooth positive curve in the Lagrangian Grassmannian associated with the $2n$ dimensional symplectic vector space of Jacobi fields. We show how to solve the Sachs equations in full generality for microcosms and, moreover, we relate the power series expansions canonical solutions to the Sachs equations on a general plane wave to Bernoulli-like recursions. It is shown that for microcosms, the curve in the Lagrangian Grassmannian associated to a microcosm is an orbit of a one parameter group in $\operatorname{Sp}(2n,\mathbb R)$. We also give an effective method for determining the orbit. Finally, we specialize to the case of $n=2$, and give analytical formulae for the solutions to the Sachs equations and the associated one-parameter group orbit., Comment: 29 pages

Published
2024

21. Sachs equations and plane waves II: Isometries and conformal isometries

Author

Holland, Jonathan and Sparling, George

Subjects
Mathematical Physics, General Relativity and Quantum Cosmology, 83C35
Abstract

This article describes the symmetries of plane wave spacetimes in dimension four and greater. It begins with a description of the isometric automorphisms, and in particular the homogeneous plane waves. Then the article turns to describing isometries from one plane wave to another. The structure of the isometries is relevant for the problem of classifying vacuum spacetimes by observables, and the article presents an explicit example of a family of vacuum spacetimes encoding the Bernoulli shift, and so not classifiable by observables. Next, the article turns to a description of the conformal isometries. Here it is assumed that the conformal curvature does not vanish identically, the case of Minkowski space being both trivial and very degenerate. The article then classifies all conformal automorphisms and isometries of plane waves of the Rosen and Brinkmann forms.

Published
2024

23. Sachs equations and plane waves, I: Rosen universes

Author

Holland, Jonathan and Sparling, George

Subjects
General Relativity and Quantum Cosmology, Mathematical Physics, 83C35
Abstract

This article, the first in a series, analyzes the general theory of plane wave spacetimes. Following Dmitri Aleekseevsky, these are defined as spacetimes admitting a group of dilations leaving invariant a smooth curve. If this curve is specified as part of the structure, the spacetime is termed a Penrose limit, whose theory was developed first by Roger Penrose. The main result is that every plane wave is a Rosen universe, a generalization of the smooth metrics of Albert Einstein and Nathan Rosen, allowing for certain isolated co-ordinate singularities; the latter are characterized. We conclude with an extended example, using the techniques developed in the article to associate a vacuum plane wave in four dimensions to any hyperbolic billiard trajectory.

Published
2024

26. On chromonatural inflation in string theory

Author

Holland, Jonathan, Zavala, Ivonne, and Tasinato, Gianmassimo

Subjects
High Energy Physics - Theory, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Sourced gravitational waves in chromonatural inflation (CNI) can give rise to a chiral spectrum of tensor fluctuations that is considerably enhanced relative to the vacuum fluctuations. If the field content of CNI acts purely as a spectator (SCNI), the inflationary sector can be consistent with current data making SCNI very appealing in view of future observations. We investigate the prospects of embedding SCNI in string theory, in the framework of K\"ahler inflation in type IIB large volume string compactifications, with a spectator sector associated with gaugino condensation on multiply magnetised D7-branes. We first introduce a generalised field theory framework that describes non-trivial multifield inflation coupled to gauge fields of the form generically arising in supergravity and string theory. We then use these results to study numerically and analytically both the background evolution and the dynamics of cosmological perturbations. We show that a successful inflationary background evolution with a large enhancement of the gravitational wave spectrum and a controllable backreaction from the amplified tensor fluctuations can be achieved by considering suitable values of three parameters present in our scenario: the magnetic flux, the degree of the condensing gauge group and the wrapping number of the D7-brane. On the other hand, the required values for these quantities may present a challenge for its successful realisation within string theory. We also discuss these challenges and the model from the viewpoint of the weak gravity conjecture., Comment: 43 pages, 21 figures. References updated, typos corrected

Published
2020
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28. Cosmological implications of spectator and dynamical fields during inflation

Author

Holland, Jonathan, Zavala, Ivonne, Tasinato, Gianmassimo, and Nunez, Carlos

Abstract

Some possible cosmological implications of the inclusion of spectator gauge fields in the inflationary action are considered. In this context, a spec-tator field is a field that is not directly responsible for inflation but can affect cosmological observables. Spectator gauge fields can lead to novel and distinguishable features in inflationary models (as compared to single-field inflation) that may be detectable. A model of anisotropic inflation is considered where universal anisotropy is maintained through a vector field that is coupled to both the inflaton and its derivative. The derivative cou-pling reduces the anisotropy induced when compared to the non-derivative case, reducing tension with observations. SU(N) gauge fields appear natu-rally in the actions of string inflation models. The inclusion of an SU(N) gauge field coupled both to scalars and pseudo-scalars (axions) is considered in two models of string inflation whose inflatons are K¨ahler moduli: K¨ahler moduli inflation and fibre inflation. It is shown that the coupling between the axion and the gauge field can lead to a large (chiral) enhancement of the tensor spectrum of these two models. In the case of K¨ahler moduli inflation, a model that generically predicts an unobservable value for the tensor-to-scalar ratio (r  10−3), this enhancement is capable of boost-ing the tensor-to-scalar ratio to values that will be potentially observable at next generation detectors. However, the parameters required to achieve this goal may present a challenge for its successful realisation in string theory. In the case of fibre inflation, a model that generically predicts an observable value for the tensor-to-scalar ratio, it is shown that this enhancement can render the tensor spectrum of fibre inflation almost entirely chiral, giving it a distinguishable feature that may be detectable.

Published
2020
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29. The conformal, complex and non-commutative structures of the Schwarzschild solution

Author

Holland, Jonathan and Sparling, George

Subjects
Mathematical Physics, General Relativity and Quantum Cosmology, 83C15 (Primary), 83C75 (Secondary)
Abstract

The generic null geodesic of the Schwarzschild--Kruskal--Szekeres geometry has a natural complexification, an elliptic curve with a cusp at the singularity. To realize that complexification as a Riemann surface without a cusp, and also to ensure conservation of energy at the singularity, requires a branched cover of the space-time over the singularity, with the geodesic being doubled as well to obtain a genus two hyperelliptic curve with an extra involution. Furthermore, the resulting space-time obtained from this branch cover has a Hamiltonian that is null geodesically complete. The full complex null geodesic can be realized in a natural complexification of the Kruskal--Szekeres metric., Comment: 18 pages, 7 figures

Published
2018

30. Anisotropic Inflation with Derivative Couplings

Author

Holland, Jonathan, Kanno, Sugumi, and Zavala, Ivonne

Subjects
High Energy Physics - Theory, Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology
Abstract

We study anisotropic inflationary solutions when the inflaton and its derivative couple to a vector field. This type of coupling is motivated by D-brane inflationary models, in which the inflaton, and a vector field living on the D-brane, couple disformally (derivatively). We start by studying a phenomenological model where we show the existence of anisotropic solutions and demonstrate their stability via a dynamical system analysis. Compared to the case without a derivative coupling, the anisotropy is reduced and thus can be made consistent with current limits, while the value of the slow-roll parameter remains almost unchanged. We also discuss solutions for more general cases, including D-brane like couplings., Comment: 15 pages, 2 figures. References added, typos and minor errors corrected. Improved discussion on solutions. Version to appear in PRD

Published
2017
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31. Soil Sensing

Author

Adamchuk, Viacheslav I., Biswas, Asim, Huang, Hsin-Hui, Holland, Jonathan E., Taylor, James A., Stenberg, Bo, Wetterlind, Johanna, Singh, Kanika, Minasny, Budiman, Fidelis, Chris, Yinil, David, Sanderson, Todd, Snoeck, Didier, Field, Damien J., Oliver, Margaret A., Series Editor, Kerry, Ruth, editor, and Escolà, Alexandre, editor

Published
2021
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32. Circumstantial Disconnection: Homelessness and Parental Relationships with Children

Author

Holland, Jonathan and Branham, David,

Abstract

This article looks at homeless individuals to see how they think their residential situation affects their relationship with their non-homeless children. Using a survey of 75 homeless parents in Houston, Texas this analysis finds that homeless parents of non-homeless children believe that their living situation has a detrimental impact on their relationship with their children. While many respondents felt that they had a good relationship with their children the chances of maintaining a good relationship were less for respondents with adult children than minor children. While a majority of respondents with children felt that finding housing stability would help their relationship with their children, those with minority children were more optimistic that finding a permanent home would help them improve their parent-child relationship than those with older children.

Published
2016

35. DARI Evaluation Syndesmosis

Author

Anciano, Victor, primary, Edwards, Campbell, additional, Likine, Elive, additional, Rimer, Ernest, additional, Holland, Jonathan, additional, and Hayes, Brett, additional

Published
2024
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36. Cosmology: macro and micro

Author

Holland, Jonathan and Sparling, George

Subjects
General Relativity and Quantum Cosmology
Abstract

A new approach to cosmology and space-time is developed, which emphasizes the description of the matter degrees of freedom of Einstein's theory of gravity by a family of K\"ahler-Einstein Fano manifolds.

Published
2014

37. The cosmology of a fundamental scalar

Author

Holland, Jonathan and Sparling, George

Subjects
General Relativity and Quantum Cosmology, 83C60 (primary), 83F05 (secondary)
Abstract

We observe that the standard homogeneous cosmologies, those of Minkowski, de Sitter, and anti-de Sitter, which form the matrix for the Robertson--Walker scale factor, live naturally as isolated points inside a larger family of conformally flat metrics obtained by allowing a tensor containing the information of conformal symmetry breaking to be more general. So the standard cosmological metrics are parametrically unstable in this sense, and therefore unphysical. When we pass to the stable family of perturbed metrics, we immediately encounter a scalar field, which drives the conformal expansion of the universe and which automatically obeys the non-linear sine-Gordon equation. The Lagrangian for the sine-Gordon equation is a cosine potential agreeing to the fourth order with the potential used in the approach to the generation of mass in gauge theories. Accordingly we identify our geometric scalar field---actually of the type of an abelian gauge field---with the recently discovered scalar field. There are two constants in the theory: the first, named $m$, is positive and defines a mass scale for the universe; the second, named $\Lambda$, is the cosmological constant. For the space-time to be everywhere non-singular, equivalently for the (strict) dominant energy condition to hold, these constants must obey the inequality $\Lambda > m^2/4$., Comment: 11 pages

Published
2013
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39. Post-anaesthesia pulmonary complications after use of muscle relaxants (POPULAR): a multicentre, prospective observational study

Author

Abad Gurumeta, Alfredo, Abernethy, Caroline, Abigail, Patrick, Achaibar, Kira, Adam, Emily, Afshari, Arash, Agudelo Montoya, M. Elizabeth, Akgün, Fatma Nur, Aletti, Gabriele, Alkış, Neslihan, Allan, Katie, Allan, Ashley, Allaouchiche, Bernard, Allcock, Clare, Almasy, Emoke, Amey, Isobel, Amigoni, Maria, Andersen, Elin, Andersson, Peder, Anipchenko, Natalya, Antunes, Pedro, Armstrong, Earlene, Aslam, Tayyba Naz, Aslin, Bjorn, Assunção, José Pedro, Ausserer, Julia, Avvai, Mary, Awad, Nahla, Ayas Montero, Begoña, Ayuso, Mercedes, Azevedo, Patricia, Badarau, Victoria, Badescu, Roxana, Baiardo Redaelli, Martina, Baird, Colin, Baird, Yolanda, Baker, Tim, Balaji, Packianathaswamy, Bălan, Cristina, Balandin, Alina, Balescu-Arion, Carmen, Baliuliene, Vilda, Baltasar Isabel, Jorge, Baluch, Saif Nasr, Bandrabur, Daniela, Bankewitz, Carla, Barber, Katrina, Barbera, Francesco, Barcraft-Barnes, Helena, Barletti, Valentina, Barnett, Gill, Baron, Kirsty, Barros, Ana, Barsan, Victoria, Bartlett, Pauline, Batistaki, Chrysanthi, Baumgarten, Georg, Baytas, Volkan, Beauchamp, Nigel, Becerra Cayetano, Isabel A., Bell, Stephanie, Bellandi, Mattia, Belletti, Alessandro, Belmonte Cuenca, Julio, Benitez-Cano, Adela, Beretta, Luigi, Berger, Marc, Bergmann, Nicole, Bergmark, Kristina, Bermudez Lopez, Maria, Bernotaite, Monika, Beurskens, Charlotte, Bidd, Heena, Bifulco, Francesca, Bignami, Elena, Bilic, Aleksandar, Bilskiene, Diana, Bischoff, Petra, Bishop, Luke, Bjonness, Therese, Blaylock, Hether, Blethyn, Kate, Blincoe, Thomas, Blokhin, Ivan, Blunt, Nadia, Boer, Christa, Bois, Grégory, Bonicolini, Eleonora, Booth, Joanna, Borecka-Kedzierska, Miroslawa, Borstnar, Katarina, Borys, Michał, Boselli, Emmanuel, Bouvet, Lionel, Bouwman, Arthur, Bowen, Leonora, Bowrey, Sarah, Boxall, Leigh, Božić, Teodora, Bradley, Tom, Branco, Teresa, Brazzi, Luca, Brazzoni, Marcella, Brear, Tracy, Brogly, Nicolas, Brohi, Farooq, Broms, Jacob, Bubliauskas, Andrius, Bucolo, Gea Erika, Buerkle, Hartmut, Buggy, Donal, Buhre, Wolfgang, Bukauskas, Tomas, Butturini, Francesco, Byttner, Anders, Cabrera Díaz, Itahísa, Calderon, Adriana, Calhau, Ricardo, Callejo, Angel, Cammu, Guy, Campesato, Manuela, Can, Özlem S, Candeias, Margarida, Cantor, Andreea, Carise, Elsa, Carmona, Cristina, Carreteiro, Joana, Carrieri, Cosima, Carter, Anna, Casal, Manuela, Casanova, Irene, Cascella, Marco, Casero, Luis M., Casiraghi, Guiseppina Maria, Castelo-Branco, Laila, Castro Arranz, Carlos, Cernea, Daniela Denisa, Cervantes, Jesoporiol, Chandler, Ben, Charnock, Robert, Chatzimicali, Aikaterini, Chinery, Elane, Chishti, Ahmed, Chondhury, Priyakam, Christie, Emily, Christodoudiles, George, Ciardo, Stefano, Cimpeanu, Luminata, Cindea, Iulia, Cinnella, Gilda, Clark, Sebastian, Clayton, Matthew, Cocu, Simona, Collyer, Thomas, Colvin, Carie, Cope, Sean, Copeta, Filomena, Copotoiu, Sanda-Maria, Correia de Barros, Filinto, Corso, Ruggero Massimo, Cortegiani, Andrea, Costa, Gabriela, Cowton, Amanda, Cox, Nicolas, Craig, James, Cricca, Valentina, Cronin, John, Cunha, Mariana, Cuomo, Arturo, Curley, Katherine, Czuczwar, Mirosław, Dabrowska, Domenika, Damster, Sabrine, Danguy des Déserts, Marc, Daniliuc, Aura, Danninger, Thomas, Darwish, Imad, Dascalu, Corina, Davies, Kirsty, Davies, Simon, De Boer, Hans, De Flaviis, Adelisa, De Selincourt, Gabrielle, Deana, Cristian, Debaene, Bertrand, Debreceni, Gabor, Dedhia, Jatin, Delgado Garcia, Isabel, Della Rocca, Giorgio, Delroy-Buelles, Llana, Desai, Tejal, Dhillon, Parveen, Di Giacinto, Ida, Di Mauro, Piero, Diaz Gomez, Tamara V., Dimitrovski, Aleksandar, Dinic, Vesna, Dîrzu, Dan-Sebastian, Divander, Mona Britt, Dolinar, Janez, Domingues, Susana, Doolan, James, Downes, Charlotte, Dragoescu, Nicoleta Alice, Droc, Gabriela, Dum, Elisabeth, Dumitrescu, Alexandra, Duncan, Louise, Dzurňáková, Paul, Eberl, Susanne, Edwards, Jayne, Edwards, Mark, Ekelund, Kim, Ekengren, Patrik, Elghouty, Eyad, Ellerkmann, Richard, Ellis, Helen, Elme, Andreas, Ernst, Thomas, Errando, Carlos Luis, Estenes, Simao, Ewaldsson, Callis, Farid, Nahla, Featherstone, James, Febres, Daniela, Fedorov, Sergey, Feggeler, Johanna, Feijten, Prisca, Fellmann, Tobias, Fernandez Candil, Juan, Fernandez Castineira, Ana, Fernández Castineira, Juan, Fernando, Aruna, Ferrando, Carlos, Ferreira, Leonia, Ferreira, Patrick, Feyling, Anders, Filipescu, Daniela, Fleischer, Andreas, Floris, Leda, Foerster, Urs, Fox, Benjamin, Franke, Uwe, Frasca, Denis, Frey, Christian, Frost, Victoria, Fullin, Giorgio, Fumagalli, Jacopo, Furneval, Julie, Fusari, Maurizio, Gallacher, Stuart, Galushka, Svetlana, Gambale, Giorgio, Gambino, Irene, Garcia-Perez, Maria Luisa, Garg, Sanjeev, Garlak, Justyna, Gavranovic, Zeljka, Gavrilov, Roman, Gaynor, Lames, Gecaj Gashi, Agreta, Georghiou, Maria, Gerjevic, Bozena, Gferer, Gudrun, Giarratano, Antonino, Gibson, Andy, Gievski, Vanja, Giles, Julian, Gillberg, Lars, Gilowska, Katarzyna, Gilsanz Rodriguez, Fernando, Gioia, Antonio, Giovannoni, Cecilia, Girotra, Vandana, Gkinas, Dimitrios, Gkiokas, George, Godoroja, Daniela, Goebel, Ulrich, Goel, Vandana, Gonzalez, Matilde, Goranovic, Tatjana, Gornik-Wlaszczuk, Ewa, Gosavi, Smita, Gottfridsson, peter, Gottschalk, André, Granell, Manuel, Granstrom, Anna, Grassetto, Alberto, Greenwood, Anna, Grigoras, Ioana, Grintescu, Ioana, Gritsan, Alexey, Gritsan, Galina, Grynyuk, Andriy, Guadagnin, Giovanni Maria, Guarnieri, Marcello, Güçlü, Çiğdem, Guerrero Diez, Maria, Gunenc, Ferim, Günther, Ulf, Gupta, Pawan, Guttenthaler, Vera, Hack, Yvonne, Hafisayena, Ade, Hagau, Natalia, Haldar, Jagannath, Hales, Dawn, Hancı, Volkan, Hanna-Jumma, Sameer, Harazim, Hana, Harlet, Pierre, Harper, Daniel, Harris, Benjamin, Harvey, Orla, Hashimi, Medita, Hawkins, Lesley, Hayes, Conrad, Heaton, James, Heier, Tom, Helliwell, Laurence, Hemmes, Sabrine, Henderson, Kate, Hermanides, Jeroen, Hermanns, Henning, Herrera Hueso, Berta, Hestenes, Siv, Hettiarachchi, Roshane, Highgate, Judith, Hodgson, Keith, Hoelbling, Daniel, Holland, Jonathan, Horhota, Lucian, Hormis, Anil, Hribar, Renata, Hua, Alina, Humphreys, Sally, Humphries, Ryan, Humpliková, Simona, Hunt, Janez, Husnain, Ali, Hussein, Ahmed, Hyams, Benjamin, Iannuccelli, Fabrizio, Ilette, Katie, Ilyas, Carl, Inan, Turgay, India, Immaculada, Ionițăv, Victor, Irwin, Foo, Jain, Vipul, Janez, Benedikt, Jankovic, Radmilo, Jenkins, Sarah, Jenko, Matej, Jimenez, Raquel, Jiménez Gomez, Bárbara, Joachim, Sugganthi, Joelsson-Alm, Eva, John, John, Jonikaite, Lina, Jovic, Miomir, Jungwirth, Bettina, Junke, Etienne, Kabakov, Borys, Kadaoui, Salah-Din, Kanski, Andrzej, Karadag, Süheyla, Karbonskiene, Aurika, Karjagin, Juri, Kasnik, Darja, Katanolli, Fatos, Katsika, Eleni, Kaufmann, Kai, Keane, Helen, Kelly, Martin, Kent, Melanie, Keraitiene, Grazina, Khudhur, Ahmed, Khuenl-Brady, Karin, Kidd, Laurie, King, Siobhan, Kirchgäßner, Katharina, Klancir, Tino, Klucniks, Andris, Knotzer, Johann, Knowlden, Peter, Koers, Lena, Kompan, Janez, Koneti, Kiran K, Kooij, Fabian, Koolen, Eric, Koopman - van Gemert, Anna Wilhelmina Margaretha Maria, Kopp, Kristen, Korfiotis, Dimitrios, Korolkov, Oleg, Kosinová, Martina, Köstenberger, Markus, Kotzinger, Oskar, Kovačević, Marko, Kranke, Peter, Kranke, Eva, Kraus, Christiane, Kraus, Stephanie, Kubitzek, Christiane, Kucharski, Rafal, Kucukguclu, Semih, Kudrashou, Allaksandr, Kumar, Vinayak, Kummen, Live, Kunit, Cornelia, Kushakovsky, Vlad, Kuvaki, Bahar, Kuzmanovska, Biljana, Kyttari, Aikaterina, Landoni, Giovanni, Lau, Gary, Lazarev, Konstantin, Legett, Samantha, Legrottaglie, Anna Maria, Leonardi, Silvia, Leong, Maria, Lercher, Helene, Leuvrey, Matthieu, Leva, Brigitte, Levstek, Meta, Limb, James, Lindholm, Espen, Linton, Fiona, Liperi, Corradero, Lipski, Fabian, Lirk, Philipp, Lisi, Alberto, Lišková, Katarina, Lluch Oltra, Aitana, Loganathan, Vinothan, Lombardi, Stefania, Lopez, Eloisa, Lopez Rodríguez, Maria, Lorenzini, Laura, Lowicka, Malgorzata, Lugovoy, Alexander, Luippold, Madeleine, Lumb, Andrew, Macas, Andrius, Macgregor, Mark, Machado, Humberto, Maciariello, Maria, Madeira, Isabel, Maitan, Stefan, Majewski, Jacek, Maldini, Branka, Malewski, Georgia, Manfredini, Livia, Männer, Olja, Marchand, Bahareh, Marcu, Alexandra, Margalef, Jordi, Margarson, Michael, Marinheiro, Lucia, Markic, Ana, Markovic Bozic, Jasmina, Marrazzo, Francesco, Martin, Jane, Martin Ayuso, Maria, Martinez, Esteher, Martino, Enrico Antonio, Martinson, Victoria, Marusic-Gaser, Katarina, Mascarenhas, Catia, Mathis, Cindy, Matsota, Paraskevi, Mavrommati, Eleni, Mazul Sunko, Branka, McCourt, Killian, McGill, Neil, McKee, Raymond, Meço, Başak Ceyda, Meier, Sonja, Melbourne, Susan, Melbybråthen, Grethe, Meli, Andrea, Melia, Aiden, Melotti, Rita Maria, Menga, Maria Rosaria, Mercer, Pauline, Merotra, Susan, Mescolini, Silvia, Metterlein, Thomas, Michalov, Martin, Michlig, Sam, Midgley, Susan, Milić, Morena, Milojevic, Milan, Miñana, Amanda, Minto, Gary, Mirabella, Lucia, Mirea, Liliana, Mittelstädt, Ludger, Moeglen, Aude, Moise, Alida, Mokini, Zhirajr, Molin, Anna, Moltó, Luis, Monea, Maria Concetta, Montalto, Francesca, Montgomery, Jane, Montgomery, Claire, Montillo, Gerardo, Moore, Sally, Moore, Faye, Moreira, Zelia, Moreno, Tania, Moreno, Ricardo, Moret, Enrique, Moreton, Sarah, Morgan, Marianne, Moro Velasco, Concepción, Morri, Davide, Moull, Alice, Moura, Fernando, Mráz, Peter, Mrozek, Katarzyna, Mukhtar, Karim, Muniyappa, Sudeshkumar, Murray, Heather, Murthy, Burra VS, Mushambi, Mary, Nadolski, Maria, Nardelli, Pasquale, Nardin, Giordano, Navarro Pérez, Rosalía, Naveiro, Andrea, Negri, Manuela, Nesek Adam, Visnja, Neskovic, Vojislava, Neuwersch, Stefan, Neves, Miriam, Nguyen, Bavinh, Ní Eochagáin, Aisling, Nicholas, Caroline, Nightingale, Jeremy, Norrie, Kylie, Novak-Jankovic, Vesna, Novakova, Andrea, Novillo, Marta, Numan, Sandra, Oduro-Dominah, Louise, Oldner, Anders, Oliveira, Isabel, Ologoiu, Daniela, Oloktsidou, Irini, O'Reilly, Rosalind, Orlando, Alessandro, Ovezov, Alexey, Ozbilgin, Sule, Paal, Peter, Padin Barreiro, Lidia, Palugniok, Ryszard, Papaioannou, Alexandra, Papapostolou, Konstantinos, Paranthaman, Prabhakar, Pardey Bracho, Gilda, Parente, Suzana, Parfeni, Alexandru, Pasin, Laura, Passey, Samuel, Pastor, Ernesto, Patch, Sarah, Patil, Andan, Paunescu, Marilena-Alina, Pehboeck, Daniel, Pereira, Manuela, Pereira, Carla, Perez Caballero, Paula, Pérez García, Aníbal, Pérez Soto, Antonia, Perez Tejero, Gisela, Perez-Cerda, Francisco, Pesenti, Antonio, Petta, Rocco, Philippe, Simon, Pickering, David, Pico Veloso, Jandro, Pina, Pedro, Pinho-Oliveira, Vítor, Pinol, Santiago, Pinto, Rita, Pistidda, Laura, Pitterle, Manuela, Piwowarczyk, Paweł, Plotnikova, Olga, Pohl, Holger, Poldermann, Jorinde, Polkovicová, Lucia, Pompei, Livia, Popescu, Mihai, Popović, Radmila, Pota, Vincenzo, Potocnik, Miriam, Potręć, Beata, Potter, Alison, Pramod, Nalwaya, Prchalova, Martina, Preckel, Benedikt, Pugh, Richard, Pulletz, Mark, Radoeshki, Aleksandar, Rafi, Amir, Ragazzi, Riccardo, Raineri Santi, Maurizio, Rajamanickam, Tamiselvan, Rajput, Zahra, Ramachandran, Rajeskar, Ramasamy, Radhika, Ramessur, Suneil, Rao, Roshan, Rasmussen, Anders, Rato, André, Razaque, Usman, Real Navacerrada, M. Isabel, Reavley, Caroline, Reid, James, Reschreiter, Henrik, Rial, Erick, Ribas Carrasco, Patricia, Ribeiro, Sandy, Rich, Nathalie, Richardson, Lydia, Rimaitis, Kestutis, Rimaitis, Marius, Ringvold, Else-Marie, Ripke, Fabian, Ristescu, Irina, Ritchie, Keith, Ródenas, Frederic, Rodrigues, Patrícia, Rogers, Emma, Rogerson, David, Romagnoli, Stefano, Romero, Esther, Rondovic, Goran, Rose, Bernd Oliver, Roth, Winfried, Rotter, Marie-Therese, Rousseau, Guy, Rudjord, Anders, Rueffert, Henrik, Rundgren, Malin, Rupprecht, Korbinian, Rushton, Andrew, Russotto, Vincenzo, Rypulak, Elżbieta, Ryszka, Maciej, Sà, Jacinta, Sà Couto, Paula, Saby, Sandrine, Sagic, Jelena, Saleh, Omar, Sales, Gabriele, Sánchez Sánchez, Yván, Sanghera, Sumayer, Şanli Karip, Ceren, Santiveri Papiol, Francisco Javier, Santos, Sofia, Sarno, Stephen, Saul, Daniel, Saunders, David, Savic, Nenad, Scalco, Loïc, Scanlon, Deborah, Schaller, Stefan, Schax, Christoph, Scheffer, Gert Jan, Schening, Anna, Schiavone, Vincenzo, Schmidt-Ehrenberg, Florian, Schmidt-Mutter, Catherine, Schönberg, Christina, Schopflin, Christian, Schreiber, Jan-Uwe, Schultz, Marcus, Schurig, Marlen, Scott, Carmen, Sebestian, Siby, Sehgal, Selena, Sem, Victoria, Semenas, Egidijus, Serafini, Elena, Serchan, Pashalitsa, Shields, Martin, Shobha, Ramakrishnan, Shosholcheva, Mirjana, Siamansour, Tanja, Siddaiah, Narendra, Siddiqi, Khalid, Sinclair, Rhona, Singh, Permendra, Singh, Rajendra, Sinha, Aneeta, Sinha, Ashok, Skinner, Amanda, Smee, Elizabeth, Smekalova, Olga, Smith, Neil, Smith, Thomas, Smitz, Carine, Smole, Daniel, Sojčić, Nataša, Soler Pedrola, Maria, Somanath, Sameer, Sonksen, Julian, Sorella, Maria Christina, Sörmus, Alar, Soro, Marina, Soto, Carmen, Spada, Anna, Spadaro, Savino, Spaeth, Johannes, Sparr, Harald, Spielmann, Annika, Spindler-Vesel, Alenka, Stamelos, Matthaios, Stancombe L, Liucia, Stanculescu, Andreea, Standl, Thomas, Standley, Tom, Stanek, Ondrej, Stanisavljević, Snežana, Starczewska, Malgorzata, Stäuble, Christiane, Steen, Julie, Stefan, Oana Maria, Stell, Elizabeth, Stera, Caterina, Stevens, Markus, Stoerckel, Marlène, Stošić, Biljana, Stourac, Petr, Stroumpoulis, Konstantinos, Struck, Rafael, Suarez de la Rica, Alejandro, Sultanpori, Altaf, Sundara Rajan, Rajinikanth, Suying, Ong, Svensen, Christer, Swan, Louise, Syrogianni, Paulina, Sysiak, Justyna, Szederjesi, Janos, Taddei, Stefania, Tan Hao, Ern, Tanou, Virginia, Tarabová, Katarina, Tardaguila Sancho, Paula, Tarroso, Maria, Tartaglione, Marco, Taylor, Emma, Tbaily, Lee, Telford, Richard, Terenzoni, Massimo, Theodoraki, Kassiani, Thornley, Helen, Tiganiuc, Liviu, Toim, Hardo, Tomescu, Dana, Tommasino, Concezione, Toni, Jessica, Toninelli, Arturo, Toretti, Ilaria, Townley, Stephen, Trepenaitis, Darius, Trethowan, Brian, Tsaousi, Georgia, Tsiftsi, Aikaterini, Tudor, Adrada, Turan, Güldem, Turhan, Sanem Çakar, Unic-Stojanovic, Dragana, Unterbuchner, Christoph, Unzueta, Carmen, Uranjek, Jasna, Ursic, Tomaz, Vaida, Simona, Valldeperas Ferrer, Silvia, Valldeperas Hernandez, Maria Inmaculada, Valsamidis, Dimitri, Van Beek, Rienk, Van dasselaer, Nick, Van Der Beek, Tim, Van Duivenvoorde, Yoni, van Klei, Wilton A., Van Poorter, Frans, Van Zaane, Bas, Van Zundert, Tom, Van Zyl, Rebekka, Vargas Munoz, Ana Milena, Varsani, Nimu, Vasconcelos, Pedro, Vassilakis, Georgios, Vecchiatini, Tommaso, Vecera, Lubomir, Vercauteren, Marcel, Verdouw, Bas, Verheyen, Veerle, Verri, Marco, Vicari Sottosanti, Luigi Giancarlo, Vico, Manuel, Vidal Mitjans, Patricia, Vilardi, Anna, Vissicchio, Daniela, Vitale, Giovanni, Vitković, Bibiana, Vizcaychipi, Marcela Paola, Voicu, Alexandra, Voje, Minca, Volfová, Ivana, Volta, Carlo Alberto, Von Lutterotti, Theresa, von Tiesenhausen, Anna, Vrecic-Slabe, Simona, Vukcevic, Dejan, Vukovic, Rade, Vullo, P. Agostina, Wade, Andrew, Wallberg, Hanna, Wallden, Jakob, Wallner, Johann, Walther Sturesson, Louise, Watson, Davina, Weber, Stefan, Wegiel Leskiewiq, Anna, Weller, Debbie, Wensing, Carine, Werkmann, Markus, Westberg, Henrik, Wikström, Erik, Williams, Benedict, Wilson, Robin, Wirth, Steffen, Wittmann, Maria, Wood, Laura, Wright, Stella, Zachoval, Christian, Zambon, Massimo, Zampieri, Silvia, Zampone, Salvatore, Zangrillo, Alberto, Zani, Gianluca, Zavackiene, Asta, Zieglerder, Raphael, Zonneveldt, Harry, Zsisku, Lajos, Zucker, Tom-Philipp, Żukowski, Maciej, Zuleika, Mehrun, Zupanĕiĕ, Darja, Kirmeier, Eva, Eriksson, Lars I, Lewald, Heidrun, Jonsson Fagerlund, Malin, Hoeft, Andreas, Hollmann, Markus, Meistelman, Claude, Hunter, Jennifer M, Ulm, Kurt, and Blobner, Manfred

Published
2019
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40. A two-dimensional $C^{2,1}$ metric with no local $C^2$ embedding in $\mathbb{R}^3$, following Pogorelov

Author

Holland, Jonathan

Subjects
Mathematics - Differential Geometry, 53C42
Abstract

This article presents a proof of Pogorelov's result that there exists a $C^{2,1}$ metric with no local $C^2$ realization in $\mathbb{R}^3$. It also construct in a very elementary way a $C^{1,1}$ realization of this metric. Pogorelov's result is somewhat controversial among the community of researchers that study isometric immersions. This in part owes to the lack of details in Pogorelov's original paper. The chief aim of the paper is therefore to provide the missing details. The construction is the same as Pogorelov's, although the verification differs in some important respects., Comment: 7 pages, 1 figure

Published
2012

41. A note on the ultrahyperbolic wave equation in 3+3 dimensions

Author

Holland, Jonathan

Subjects
Mathematical Physics, 53C28, 83C60
Abstract

The article concerns the relationship between the ultrahyperbolic wave operator and the Xi transform for flat space, introduced by Sparling (2007). The main theorem is that the wave operator and the Xi transform form an exact couple: the image of the wave operator is the kernel of the Xi transform and, vice versa, the image of the Xi transform is the kernel of the wave operator., Comment: 5 pages

Published
2012

42. Notes on symmetric spaces

Author

Holland, Jonathan and Ion, Bogdan

Subjects
Mathematics - Differential Geometry, 53C35
Abstract

These are notes from a lecture course on symmetric spaces by the second author given at the University of Pittsburgh in the fall of 2010., Comment: 109 pages

Published
2012

43. Asymptotically shearfree congruences in (2,2) spacetimes and Burgers' equation

Author

Holland, Jonathan and Sparling, George

Subjects
Mathematics - Differential Geometry, Mathematical Physics
Abstract

The paper proves that any asymptotically shearfree congruence at the conformal infinity (scri) in a (2,2)-signature spacetime is determined locally by a solution to the pair of forced inviscid Burgers' equations L_u+LL_x={\sigma}(u,x,y,L) and M_u+MM_y={\sigma}'(u,x,y,M) where u,x,y are Bondi coordinates of scri. The functions {\sigma} and {\sigma}' are determined naturally by the projective structure on the {\alpha} and {\beta} surfaces that foliate scri., Comment: 13 pages

Published
2012

44. Causal geometries, null geodesics, and gravity

Author

Holland, Jonathan and Sparling, George

Subjects
Mathematics - Differential Geometry, 53C22 (primary) 53C50, 53C60 (secondary)
Abstract

The authors study a generalized notion of null geodesic defined by the Legendrian dynamics of a regular conical subbundle of the tangent bundle on a manifold. A natural extension of the Weyl tensor is shown to exist, and to depend only on this conical subbundle. Given a suitable defining function of the conical bundle, the Raychaudhuri--Sachs equations of general relativity continue to hold, and give rise to the same phenomenon of covergence of null geodesics in regions of positive energy that underlies the theory of gravitation., Comment: 42 pages

Published
2011

45. Causal geometries and third-order ordinary differential equations

Author

Holland, Jonathan and Sparling, George

Subjects
Mathematics - Differential Geometry, Mathematics - Symplectic Geometry, 53D10, 53B40
Abstract

We discuss contact invariant structures on the space of solutions of a third-order ordinary differential equation. Associated to any third-order differential equation modulo contact transformations, Chern introduced a degenerate conformal Lorentzian metric on the space of 2-jets of functions of one variable. When the Wuenschmann invariant vanishes, the degenerate metric descends to a proper conformal Lorentzian metric on the space of solutions. In the general case, when the Wuenschmann invariant is not zero, we define the notion of a causal geometry, and show that the space of solutions supports one. The Wuenschmann invariant is then related to the projective curvature of the indicatrix curve cut out by the causal geometry in the projective tangent space. When the Wuenschmann vanishes, the causal structure is then precisely the sheaf of null geodesics of the Chern conformal structure. We then introduce a Lagrangian and associated Hamiltonian from which the degenerate conformal Lorentzian metric are constructed. Finally, necessary and sufficient conditions are given for a rank three degenerate conformal Lorentzian metric in four dimensions to correspond to a third-order differential equation.

Published
2009

46. Space-time and G_2

Author

Doubrov, Boris, Holland, Jonathan, and Sparling, George

Subjects
General Relativity and Quantum Cosmology
Abstract

A Weyl structure is a bundle over space-time, whose fiber at each space-time point is a space of maximally isotropic complex tangent planes. We develop the theory of Weyl connections for Weyl structures and show that the requirement that the connection be torsion-free fixes the Weyl connection uniquely. Further we show that to each such Weyl connection, there is naturally associated a (2, 3, 5)-Pfaffian system, as first analyzed by Cartan. We determine the associated G_2-conformal structure and calculate it explicitly in the cases of the Kapadia family of space-times and of the Schwarzschild solution, Comment: 49 pages

Published
2009

47. Soil Sensing

Author

Adamchuk, Viacheslav I., primary, Biswas, Asim, additional, Huang, Hsin-Hui, additional, Holland, Jonathan E., additional, Taylor, James A., additional, Stenberg, Bo, additional, Wetterlind, Johanna, additional, Singh, Kanika, additional, Minasny, Budiman, additional, Fidelis, Chris, additional, Yinil, David, additional, Sanderson, Todd, additional, Snoeck, Didier, additional, and Field, Damien J., additional

Published
2021
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48. Analog/Mixed-Signal Design in FinFET Technologies

Author

Loke, Alvin L. S., Terzioglu, Esin, Kumar, Albert A., Wee, Tin Tin, Rim, Kern, Yang, Da, Yu, Bo, Ge, Lixin, Sun, Li, Holland, Jonathan L., Lee, Chulkyu, Song, Deqiang, Yang, Sam, Zhu, John, Choi, Jihong, Lakdawala, Hasnain, Chen, Zhiqin, Chen, Wilson J., Dundigal, Sreeker, Knol, Stephen R., Tan, Chiew-Guan, Song, Stanley S. C., Dang, Hai, Drennan, Patrick G., Yuan, Jun, Chidambaram, P. R., Jalilizeinali, Reza, Dillen, Steven J., Kong, Xiaohua, Leary, Burton M., Harpe, Pieter, editor, Makinwa, Kofi A. A., editor, and Baschirotto, Andrea, editor

Published
2018
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50. Conformally invariant powers of the ambient Dirac operator

Author

Holland, Jonathan and Sparling, George

Subjects
Mathematics - Differential Geometry, 53A30
Abstract

This paper constructs a family of conformally invariant differential operators acting on spinor densities with leading part a power of the Dirac operator. The construction applies for all powers in odd dimensions, and only for finitely many powers in even dimensions. These operators arise naturally as obstructions to formal solution of the Dirac equation on the Fefferman-Graham ambient space with prescribed boundary conditions., Comment: 16 pages

Published
2001

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