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455 results on '"Heller, Markus"'

1. Causal Temporal Renormalisation Group Flow of the Energy-Momentum Tensor

Author

Heller, Markus and Pawlowski, Jan M.

Subjects
High Energy Physics - Theory, Condensed Matter - Other Condensed Matter, Condensed Matter - Statistical Mechanics, High Energy Physics - Phenomenology
Abstract

We derive the temporal renormalisation group flow of the energy-momentum tensor at the example of a general scalar theory. The local causal structure of the temporal renormalisation group flow allows to monitor and control causality, unitarity and general conservation laws at each infinitesimal renormalisation group step. We explore energy-conserving truncations in a comparison of generic flows and the causal temporal flow of the energy-momentum tensor. We also observe that the temporal regulator preserves scale invariance, which is violated for generic momentum regulators. Specifically we discuss the relation of these terms to the trace anomaly of the energy-momentum tensor. Moreover, we show that the causal temporal flow of the energy-momentum tensor can be integrated analytically, and demonstrate, that the result is consistent with energy conservation., Comment: 9 pages, 4 figures

Published
2021

2. Knieendoprothetik: Biomechanik des Kniegelenks

Author

Duda, Georg N., Moewis, Philippe, Hommel, Hagen, Heller, Markus O., Taylor, William R., Bergmann, Georg, Trepczynski, Adam, Matziolis, Georg, Section editor, Pfitzner, Tilman, Section editor, Reichel, Heiko, Section editor, Wirtz, Dieter, Section editor, Wirtz, Dieter Christian, editor, Reichel, Heiko, editor, Matziolis, Georg, editor, and Pfitzner, Tilman, editor

Published
2023
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3. Flowing with the Temporal Renormalisation Group

Author

Corell, Lukas, Cyrol, Anton K., Heller, Markus, and Pawlowski, Jan M.

Subjects
High Energy Physics - Theory, Condensed Matter - Other Condensed Matter, Condensed Matter - Statistical Mechanics, High Energy Physics - Phenomenology
Abstract

We discuss the far-from-equilibrium evolution of $\phi^3$-theory in $1+1$ dimensions with the temporal functional renormalisation group \cite{Gasenzer:2007za, Gasenzer:2010rq}. In particular, we show that this manifestly causal approach leads to novel one-loop exact equations for fully dressed correlation functions. Within this setup, we numerically compute the dynamical propagator. Its behaviour suggests self-similarity far from equilibrium in a restricted momentum regime. We discuss the scaling exponents for our solution, as well as the numerical satisfaction of energy and particle number conservation. We also derive a simple exact representation of the expectation value of the energy-momentum tensor solely in terms of the propagator., Comment: 16 pages, 16 figures. v2: Added comments in Secs. II and III, added refs, corrected typos

Published
2019
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6. The Goldstino Brane, the Constrained Superfields and Matter in N=1 Supergravity

Author

Bandos, Igor, Heller, Markus, Kuzenko, Sergei M., Martucci, Luca, and Sorokin, Dmitri

Subjects
High Energy Physics - Theory
Abstract

We show that different (brane and constrained superfield) descriptions for the Volkov-Akulov goldstino coupled to N=1, D=4 supergravity with matter produce similar wide classes of models with spontaneously broken local supersymmetry and discuss the relation between the different formulations. As with the formulations with irreducible constrained superfields, the geometric goldstino brane approach has the advantage of being manifestly off-shell supersymmetric without the need to introduce auxiliary fields. It provides an explicit solution of the nilpotent superfield constraints and avoids issues with non-Gaussian integration of auxiliary fields. We describe general couplings of the supersymmetry breaking sector, including the goldstino and other non-supersymmetric matter, to supergravity and matter supermultiplets. Among various examples, we discuss a goldstino brane contribution to the gravitino mass term and the supersymmetrization of the anti-D3-brane contribution to the effective theory of type IIB warped flux compactifications., Comment: Dedicated to the memory of Mario Tonin, 47 pages; v2,v3: comments and references added, typos corrected

Published
2016
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7. Pion and $\eta$-meson mass splitting at the two-flavour chiral crossover

Author

Heller, Markus and Mitter, Mario

Subjects
High Energy Physics - Phenomenology
Abstract

We study the splitting in the screening mass of pions and the $\eta$-meson across the chiral crossover. This splitting is determined by the 't Hooft determinant. We use results for the renormalisation group scale dependence of the 't Hooft determinant obtained within the functional renomalisation group in quenched QCD with two flavours. The scale dependence of the 't Hooft determinant is mapped to its temperature dependence with the help of a Polyakov-quark-meson model. As a result we obtain the temperature dependence of the splitting in the screening mass of pions and the $\eta$-meson.

Published
2015
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9. List of contributors

Author

Aicale, Rocco, primary, Aldieri, Alessandra, additional, Andersen, Michael Skipper, additional, Armaroli, Federica, additional, Audenino, Alberto, additional, Bori, Edoardo, additional, Breen, Alexander Cleveland, additional, Cacopardo, Ludovica, additional, Camus, Emmannuel J., additional, Cheong, Vee San, additional, Dalla Pria, Paolo, additional, Dall’Ara, Enrico, additional, Dürselen, Lutz, additional, El-Rich, Marwan, additional, Freutel, Maren, additional, Galbusera, Fabio, additional, Heller, Markus O., additional, Hoepfner, Yana, additional, Innocenti, Bernardo, additional, Jonas, René, additional, La Barbera, Luigi, additional, Labey, Luc, additional, Lopomo, Nicola Francesco, additional, Maffulli, Nicola, additional, Moungondo, Fabian, additional, Neidlinger-Wilke, Cornelia, additional, Oliva, Francesco, additional, Overstraeten, Luc Van, additional, Pankaj, Pankaj, additional, Pianigiani, Silvia, additional, Putame, Giovanni, additional, Robbins, Dan, additional, Scheys, Lennart, additional, Schlager, Benedikt, additional, Seitz, Andreas Martin, additional, Sholukha, Victor, additional, Teixeira, Graciosa Quelhas, additional, Terzini, Mara, additional, Van Sint Jan, Serge, additional, Villa, Tomaso, additional, Warnecke, Daniela, additional, Wilke, Hans-Joachim, additional, and Zacchetti, Sara, additional

Published
2022
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10. The systematics and nomenclature of the Dodo and the Solitaire (Aves: Columbidae), and an overview of columbid family-group nomina.

Author

Young, Mark T, Hume, Julian P, Day, Michael O, Douglas, Robert P, Simmons, Zoë M, White, Judith, Heller, Markus O, and Gostling, Neil J

Subjects
NATURAL history, NINETEENTH century, COLUMBIDAE, TWENTIETH century, NATURALISTS
Abstract

The Dodo and its extinct sister species, the Solitaire, are iconic exemplars of the destructive capabilities of humanity. These secondarily terrestrial columbids became extinct within a century of their first encounter with humanity. Their rapid extinction, with little material retained in natural history collections, led 18th and some early 19th century naturalists to believe that these aberrant birds were mythological. This meant that the nomenclatural publications in which their scientific nomina were established were based on accounts written before the species became extinct. As such, no type specimens were designated for either the Dodo or the Solitaire. Our in-depth historical overview of both species and associated family-group nomina found that the nominal authority of the Dodo-based family group is not what is reported in the literature. Moreover, our detailed review of the family-group nomina based on columbid genera ensures that the current columbid family-group systematization is valid. Changing nomenclatural norms between the 19th and 20th centuries had a profound impact on Dodo nomenclature; so much so that the Dodo is an example of how pervasive nomenclatural 'ripples' can be and a warning for our current world of multiple nomenclatural codes. [ABSTRACT FROM AUTHOR]

Published
2024
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16. On Some Challenges in Business Systems Management and Engineering for the Networked Enterprise of the Future

Author

Friesen, Andreas, Theilmann, Wolfgang, Heller, Markus, Lemcke, Jens, Momm, Christof, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Ardagna, Claudio A., editor, Damiani, Ernesto, editor, Maciaszek, Leszek A., editor, Missikoff, Michele, editor, and Parkin, Michael, editor

Published
2012
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17. Enabling USDL by Tools

Author

Heller, Markus, Schmeling, Benjamin, Heinzl, Steffen, Leidig, Torsten, Duddy, Keith, Sandfuchs, Thorsten, Klein, Andreas, Allgaier, Matthias, Barros, Alistair, editor, and Oberle, Daniel, editor

Published
2012
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21. Tool Support for Dynamic Development Processes

Author

Heer, Thomas, Heller, Markus, Westfechtel, Bernhard, Wörzberger, René, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Engels, Gregor, editor, Lewerentz, Claus, editor, Schäfer, Wilhelm, editor, Schürr, Andy, editor, and Westfechtel, Bernhard, editor

Published
2010
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25. Process Evolution Support in the AHEAD System

Author

Heller, Markus, Schleicher, Ansgar, Westfechtel, Bernhard, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Pfaltz, John L., editor, Nagl, Manfred, editor, and Böhlen, Boris, editor

Published
2004
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26. Interorganizational Management of Development Processes

Author

Heller, Markus, Jäger, Dirk, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Pfaltz, John L., editor, Nagl, Manfred, editor, and Böhlen, Boris, editor

Published
2004
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27. Graph-Based Tools for Distributed Cooperation in Dynamic Development Processes

Author

Heller, Markus, Jäger, Dirk, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Pfaltz, John L., editor, Nagl, Manfred, editor, and Böhlen, Boris, editor

Published
2004
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28. Graph-Based Specification of a Management System for Evolving Development Processes

Author

Heller, Markus, Schleicher, Ansgar, Westfechtel, Bernhard, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Pfaltz, John L., editor, Nagl, Manfred, editor, and Böhlen, Boris, editor

Published
2004
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41. A Temporal Functional Renormalisation Group Approach to Non-Perturbative Quantum Dynamics

Author

Heller, Markus

Subjects
530 Physics, 500 Natural sciences and mathematics
Abstract

In this work, we substantially advance the formalism of the temporal functional renormalisation group which constitutes a non-perturbative framework for computing the dynamics of correlation functions in quantum field theories. To that end we carefully revisit the derivation of the temporal flow equation, paying particular attention to properties arising from a causal temporal regulator. We use the manifest causality of the formalism to integrate the general temporal flow analytically. The result are novel one-loop exact equations for fully dressed correlation functions. Further leveraging causality, we derive the complete Dyson-Schwinger hierarchy and the s-channel effective vertex in terms of specific truncations of the temporal flow. We solve the problem of renormalising the general causal temporal flow. We demonstrate that certain types of causal integral equations can be solved by an explicit numerical method. We numerically solve the integrated flow in a truncation involving the propagator of the $\phi^3$-theory in $1+1$ dimensions. Our results indicate the emergence of universal dynamics. Due to the high degree of flexibility of approximation schemes of the temporal flow, energy conservation in generic truncations is not guaranteed automatically but becomes a non-trivial feature instead. We explore energy-conserving truncations by deriving the causal temporal flow of the energy-momentum tensor, which we integrate analytically.

Published
2021
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47. The conformation of cyclo(-D-pro-[Ala.sub.4]-) as a model for cyclic pentapeptides of the D[L.sub.4] type

Author

Heller, Markus, Sukopp, Martin, Tsomaia, Natia, John, Michael, Mierke, Dale F., Reif, Bernd, and Kessler, Horst

Subjects
Peptides -- Structure, Peptides -- Chemical properties, Nuclear magnetic resonance spectroscopy -- Usage, Conformational analysis -- Methods, Cyclic compounds -- Chemical properties, Cyclic compounds -- Structure, Chemistry
Abstract

A study uses nuclear magnetic resonance (NMR) techniques to explore the conformation of the cyclic pentapeptide cyclo(-D-Pro-[Ala.sub.4-]. Results demonstrated are in complete accord with the conclusions of an earlier study that p[A.sub.4] adopts a conformation with a stable BetaII'-turn with the D-amino acid in the I + 1 position, while the lower half of the molecule around Ala4 is flexible, with transitions between a gamma-turn and a conformation with both amides projecting on the same face.

Published
2006

48. Characterization of human saposins by NMR spectroscopy

Author

John, Michael, Wendeler, Michaela, Heller, Markus, Sandhoff, Konrad, and Kessler, Horst

Subjects
Nuclear magnetic resonance spectroscopy -- Usage, Glycoproteins -- Chemical properties, Enzymes -- Chemical properties, Biological sciences, Chemistry
Abstract

The solution NMR spectroscopy is employed to characterize all four (super 15)N-labeled human saposins at both neutral and acidic pH. The results reveal that pH 4.0, where all saposins are highly unstable, Sap-C undergoes a transition to a specific dimeric state, which might resemble the structure found in both Sap-C in a detergent environment and crystals of Sap-B.

Published
2006

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