812 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
The holographic p+ip solution failed to win the competition in dRGT massive gravity
In this paper, the holographic p-wave superfluid model with charged complex
vector field is studied in dRGT massive gravity beyond the probe limit. The
stability of p-wave and p+ip solutions are compared in the grand canonical
ensemble. The p-wave solution always get lower value of grand potential than
the p+ip solution, showing that the holographic system still favors an
anisotropic (p-wave) solution even with considering a massive gravity theory in
bulk. In the holographic superconductor models with dRGT massive gravity in
bulk, a key sailing symmetry is found to be violated by fixing the reference
metric parameter . Therefore, in order to get the dependence of condensate
and grand potential on temperature, different values of horizon radius should
be considered in numerical work. With a special choice of model parameters, we
further study the dependence of critical back-reaction strength on the graviton
mass parameter, beyond which the superfluid phase transition become first
order. We also give the dependence of critical temperature on the back reaction
strength and graviton mass parameter .Comment: 16 pages, 4 figure
Event patterns from negative pion spectra in proton-proton and nucleus-nucleus collisions at SPS
Rapidity-dependent transverse momentum spectra of negatively charged pions
measured at different rapidities in proton-proton collisions at the Super
Proton Synchrotron (SPS) at various energies within its Beam Energy Scan (BES)
program are investigated by using one- and two-component standard distributions
where the chemical potential and spin property of particles are implemented.
The rapidity spectra are described by a double-Gaussian distribution. At the
stage of kinetic freeze-out, the event patterns are structured by the scatter
plots in the three-dimensional subspaces of velocity, momentum and rapidity.
The results of the studies of the rapidity-independent transverse mass spectra
measured at mid-rapidity in proton-proton collisions are compared with those
based on the similar transverse mass spectra measured in the most central
beryllium-beryllium, argon-scandium and lead-lead collisions from the SPS at
its BES energies.Comment: 17 pages, 9 figure
Simultaneous and Direct Determination of Vancomycin and Cephalexin in Human Plasma by Using HPLC-DAD Coupled with Second-Order Calibration Algorithms
A simple, rapid, and sensitive method for the simultaneous determination of vancomycin and cephalexin in human plasma was developed by using HPLC-DAD with second-order calibration algorithms. Instead of a completely chromatographic separation, mathematical separation was performed by using two trilinear decomposition algorithms, that is, PARAFAC-alternative least squares (PARAFAC-ALSs) and self-weight-alternative-trilinear-decomposition- (SWATLD-) coupled high-performance liquid chromatography with DAD detection. The average recoveries attained from PARAFAC-ALS and SWATLD with the factor number of 4 (N = 4) were 101 ± 5% and 102 ± 4% for vancomycin, and 96 ± 3% and 97 ± 3% for cephalexininde in real human samples, respectively. The statistical comparison between PARAFAC-ALS and SWATLD is demonstrated to be similar. The results indicated that the combination of HPLC-DAD detection with second-order calibration algorithms is a powerful tool to quantify the analytes of interest from overlapped chromatographic profiles for complex analysis of drugs in plasma
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