125,510 research outputs found

    Comment on "Novel Convective Instabilities in a Magnetic Fluid"

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    Comment on the paper "Novel Convective Instabilities in a Magnetic Fluid" by W. Luo, T. Du, and J. Huang, Phys. Rev. Lett., v.82, p.4134 (1999).Comment: 1 page, 1 figure, To appear in Phys. Rev. Lett. (2001

    MS 223 Guide to Charles T. L. Huang, PhD Papers, 1973-2002

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    The Charles T. L. Huang, PhD papers contain notebooks, experiment lab data, professional papers of Dr. Huang that detail his career at Baylor College of Medicine and Texas Children\u27s Hospital. The collection consists of 5 boxes and loose materials (binders, notebooks) equaling 5 cubic feet. See more at https://archives.library.tmc.edu/ms-223

    Supersymmetry and TT‾T \overline{T} Deformations

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    We propose a manifestly supersymmetric generalization of the solvable TT‾T \overline{T} deformation of two-dimensional field theories. For theories with (1,1)(1,1) and (0,1)(0,1) supersymmetry, the deformation is defined by adding a term to the superspace Lagrangian built from a superfield containing the supercurrent. We prove that the energy levels of the resulting deformed theory are determined exactly in terms of those of the undeformed theory. This supersymmetric deformation extends to higher dimensions, where we conjecture that it might provide a higher-dimensional analogue of TT‾T \overline{T}, producing supersymmetric Dirac or Dirac-Born-Infeld actions in special cases.Comment: 32 pages; LaTeX; references and an acknowledgement adde

    The Instanton Density at Finite Temperatures

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    For {\it low} T new strict results for the instanton density n(T) are reported. Using the PCAC methods, we express n(T) in terms of {\it vacuum} average values of certain operators, times their {\it calculated} T-dependence. At high T, we discuss the {\it applicability} limits of the perturbative results. We further speculate about possible behaviour of n(T) at T∼TcT\sim T_c

    A Correlation of Spectral Lag Evolution with Prompt Optical Emission in GRBs?

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    We report on observations of correlated behavior between the prompt gamma-ray and optical emission from GRB 080319B, which (i) strongly suggest that they occurred within the same astrophysical source region and (ii) indicate that their respective radiation mechanisms were most likely dynamically coupled. Our preliminary results, based upon a new cross-correlation function (CCF) methodology for determining the time-resolved spectral lag, are summarized as follows. First, the evolution in the arrival offset of prompt gamma-ray photon counts between Swift-BAT 15-25 keV and 50-100 keV energy bands (intrinsic gamma-ray spectral lag) appears to be anti-correlated with the arrival offset between prompt 15-350 keV gamma-rays and the optical emission observed by TORTORA (extrinsic optical/gamma-ray spectral lag), thus effectively partitioning the burst into two main episodes at ~T+28+/-2 sec. Second, prompt optical emission is nested within intervals of (a) trivial intrinsic gamma-ray spectral lag (~T+12+-2 and ~T+50+/-2 sec) with (b) discontinuities in the hard to soft evolution of the photon index for a power law fit to 15-150 keV Swift-BAT data (~T+8+/-2 and ~T+48+/-1 sec), both of which coincide with the rise (~T+10+/-1 sec) and decline (~T+50+/-1 sec) of prompt optical emission. This potential discovery, robust across heuristic permutations of BAT energy channels and varying temporal bin resolution, provides the first observational evidence for an implicit connection between spectral lag and the dynamics of shocks in the context of canonical fireball phenomenology.Comment: 5 pages. Adapted from a contribution to the Proceedings of the 2008 Nanjing GRB Conference. Edited by Y. F. Huang, Z. G. Dai and B. Zhan
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