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Your search keyword '"Nicholas Zufelt"' showing total 5 results
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5 results on '"Nicholas Zufelt"'

1. Reducible surgeries and Heegaard Floer homology

Author

Jennifer Hom, Tye Lidman, and Nicholas Zufelt

Subjects
General Mathematics, 010102 general mathematics, Physics::Medical Physics, Geometric Topology (math.GT), 01 natural sciences, Mathematics::Geometric Topology, Combinatorics, Mathematics - Geometric Topology, Floer homology, Genus (mathematics), 0103 physical sciences, FOS: Mathematics, 57M25, 57M27, 57R58, 010307 mathematical physics, 0101 mathematics, Mathematics::Symplectic Geometry, Mathematics, Knot (mathematics)
Abstract

In this paper, we use Heegaard Floer homology to study reducible surgeries. In particular, suppose K is a non-cable knot in the three-sphere with an L-space surgery. If p-surgery on K is reducible, we show that p equals 2g(K)-1. This implies that any knot with an L-space surgery has at most one reducible surgery, a fact that we show additionally for any knot of genus at most two., 15 pages, 2 figures; added an additional author and a new section (3.2) which improves Theorem 1.3

Published
2013

2. CLASSIFICATION OF TRISECTIONS AND THE GENERALIZED PROPERTY R CONJECTURE.

Author

MEIER, JEFFREY, SCHIRMER, TRENT, and ZUPAN, ALEXANDER

Subjects
NUMBER theory, MANIFOLDS (Mathematics), GENERALIZATION, GEOMETRIC connections, MATHEMATICAL decomposition, COMPACT spaces (Topology)
Abstract

We show that the members of a large class of unbalanced fourmanifold trisections are standard, and we present a family of trisections that is likely to include non-standard trisections of the four-sphere. As an application, we prove a stable version of the Generalized Property R Conjecture for c-component links with tunnel number at most c. [ABSTRACT FROM AUTHOR]

Published
2016
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3. Spitzer Observations of Star Formation in Brightest Cluster Galaxies.

Author

O'Dea, Christopher P., Quillen, Alice, Park, Jaehong, Zufelt, Nicholas, Baum, Stefi A., Privon, George, Noel-Storr, Jacob, Edge, Alastair, Russell, Helen, Fabian, Andy, Donahue, Megan, Sarazin, Craig L., McNamara, Brian, Bregman, Joel, and Egami, Eiichi

Subjects
STAR formation, STAR clusters, ASTRONOMICAL observations, ASTRONOMY, GALAXIES
Abstract

We summarize the results of Spitzer IRAC and MIPS observations of 62 brightest cluster galaxies (BCGs) with optical line emission located in the cores of X-ray luminous clusters. We find that at least half of these sources have signs of excess infrared emission. The strength of the mid-IR excess emission correlates with the luminosity of the optical emission lines. Excluding several systems dominated by an AGN, the excess mid-infrared emission in the remaining brightest cluster galaxies is likely powered by star formation. The IR luminosity (and thus star formation) is higher in BCGs with shorter cooling times in the central hot ICM suggesting that the gas which cools from the ICM ultimately forms stars. We find a correlation between mass deposition rates estimated from the X-ray emission and the star formation rate estimated from the infrared luminosity. The star formation rates are 1/10 to 1/100 of the mass deposition rates suggesting that the re-heating of the ICM is generally very effective in reducing the amount of mass cooling from the hot phase but does not eliminate it completely. [ABSTRACT FROM AUTHOR]

Published
2009
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4. An Infrared Survey of Brightest Cluster Galaxies. I.

Author

Quillen, Alice C., Zufelt, Nicholas, Park, Jaehong, O’Dea, Christopher P., Baum, Stefi A., Privon, George, Noel-Storr, Jacob, Edge, Alastair, Russell, Helen, Fabian, Andy, Donahue, Megan, Bregman, Joel N., McNamara, Brian R., and Sarazin, Craig L.

Published
2008
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