3,500 research outputs found
Two Polyakov Loop Correlators from D5-branes at Finite Temperature
We study two Polyakov loop correlators in large limit of
super Yang-Mills theory at finite temperature using the AdS-Schwarzschild black
hole. In the case that one of the two loops is of the anti-symmetric
representation, we use D5-branes to evaluate them. The phase structure of these
correlators is also examined. A previous result, derived in hep-th/9803135 and
hep-th/9803137, is realized as a limiting case.}Comment: 12 pages, 2 figure
Classical c=1 Tachyon Scattering and 1/2-BPS Correlators
We study the correlator of chiral primary operators in \Ncal=4 super
Yang-Mills theory in large limit. Through the free fermion picture, we map
the gauge group rank and R-charges in SYM to the Fermi level and tachyon
momenta, respectively, in the c=1 matrix model. By doing so, it is seen that
half-BPS correlators are reproduced by tree-level tachyon scattering
amplitudes.Comment: 7 pages, v2: typos corrected and a reference added, v3: PTP versio
D-branes in the Lorentzian Melvin Geometry
We consider string theory on the Lorentzian Melvin geometry, which is
obtained by analytically continuing the two-parameter Euclidean Melvin
background. Because this model provides a solvable conformal field theory that
describes time-dependent twisted string dynamics, we study the string one-loop
partition function and the D-brane spectrum. We found that both the wrapping
D2-brane and the codimension-one D-string emit winding strings, and this
behavior can be traced to the modified open string Hamiltonian on these probe
D-branes.Comment: 13 pages, v2,v3,v4: changes and references added, v5: final version
in PT
Anisotropic finite-size scaling analysis of a three-dimensional driven-diffusive system
We study the standard three-dimensional driven diffusive system on a simple
cubic lattice where particle jumps along a given lattice direction are biased
by an infinitely strong field, while those along other directions follow the
usual Kawasaki dynamics. Our goal is to determine which of the several existing
theories for critical behavior is valid. We analyze finite-size scaling
properties using a range of system shapes and sizes far exceeding previous
studies. Four different analytic predictions are tested against the numerical
data. Binder and Wang's prediction does not fit the data well. Among the two
slightly different versions of Leung, the one including the effects of a
dangerous irrelevant variable appears to be better. Recently proposed isotropic
finite-size scaling is inconsistent with our data from cubic systems, where
systematic deviations are found, especially in scaling at the critical
temperature.Comment: 12 pages, 14 PS figures, RevTeX; extensively revise
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