5,716 research outputs found
Gravity/Fluid Correspondence and Its Application on Bulk Gravity with Gauge Field
As the long wavelength limit of the AdS/CFT correspondence, the gravity/fluid
correspondence has been shown to be a useful tool for extracting properties of
the fluid on the boundary dual to the gravity in the bulk. In this paper, after
briefly reviewing the algorithm of gravity/fluid correspondence, we discuss the
results of its application on bulk gravity with a gauge field. In the
presence of a gauge field, the dual fluid possesses more interesting
properties such as its charge current. Furthermore, an external field
could affect the charge current, and the Chern-Simons term
also reinduces extra structures to the dual current giving anomalous transport
coefficients.Comment: 14 pages, no figure, version publishe
Event patterns extracted from anisotropic spectra of charged particles produced in Pb-Pb collisions at 2.76 TeV
Event patterns extracted from anisotropic spectra of charged particles
produced in lead-lead collisions at 2.76 TeV are investigated. We use an
inverse power-law resulted from the QCD calculus to describe the transverse
momentum spectrum in the hard scattering process, and a revised Erlang
distribution resulted from a multisource thermal model to describe the
transverse momentum spectrum and anisotropic flow in the soft excitation
process. The pseudorapidity distribution is described by a three-Gaussian
function which is a revision of the Landau hydrodynamic model. Thus, the event
patterns at the kinetic freeze-out are displayed by the scatter plots of the
considered particles in the three-dimensional velocity, momentum, and rapidity
spaces.Comment: 19 pages, 8 figures, The European Physical Journal A, accepte
Detection of treatment effects by covariate-adjusted expected shortfall
The statistical tests that are commonly used for detecting mean or median
treatment effects suffer from low power when the two distribution functions
differ only in the upper (or lower) tail, as in the assessment of the Total
Sharp Score (TSS) under different treatments for rheumatoid arthritis. In this
article, we propose a more powerful test that detects treatment effects through
the expected shortfalls. We show how the expected shortfall can be adjusted for
covariates, and demonstrate that the proposed test can achieve a substantial
sample size reduction over the conventional tests on the mean effects.Comment: Published in at http://dx.doi.org/10.1214/10-AOAS347 the Annals of
Applied Statistics (http://www.imstat.org/aoas/) by the Institute of
Mathematical Statistics (http://www.imstat.org
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