173 research outputs found
Notes on the holographic Lifshitz theory
On the Lifshitz black brane geometry of an Einstein-Maxwell-dilaton gravity,
we holographically investigate electric DC conductivities and the role of
impurity in a non-relativistic Lifshitz medium with two different charge
carriers, impurity and Lifshitz matter. The conductivity carried by Lifshitz
matter is proportional to the square of temperature, while that carried by
impurity crucially depends on the bulk coupling parameter \g. For \g < -2,
impurity at high temperature can change the electric property of the Lifshitz
medium significantly so that the Lifshitz matter with impurity can show a
totally different electric property from the pure Lifshitz matter.Comment: 17 pages, major revisio
Meson's Correlation Functions in a Nuclear Medium
We investigate meson's spectrum, decay constant and form factor in a nuclear
medium through holographic two- and three-point correlation functions. To
describe a nuclear medium composed of protons and neutrons, we consider a hard
wall model on the thermal charged AdS geometry and show that due to the isospin
interaction with a nuclear medium, there exist splittings of the meson's
spectrum, decay constant and form factor relying on the isospin charge. In
addition, we show that the -meson's form factor describing an interaction
with pseudoscalar fluctuation decreases when the nuclear density increases,
while the interaction with a longitudinal part of an axial vector meson
increases.Comment: 16 pages, 3 figure
Holographic renormalization in dense medium
We investigate the holographic renormalization of a charged black brane with
or without a dilaton field, whose dual field theory describes a dense medium at
finite temperature. In a dense medium, two different thermodynamic descriptions
are possible due to an additional conserved charge. These two different
thermodynamic ensembles are classified by the asymptotic boundary condition of
the bulk gauge field. We show that in the holographic renormalization
regularity of all bulk fields can reproduce consistent thermodynamic quantities
and that the Bekenstein-Hawking entropy is nothing but the renormalized thermal
entropy of the dual field theory. Furthermore, we find that the
Reissner-Nordstrom AdS black brane is dual to a theory with conformal matter as
expected, whereas a charged black brane with a nontrivial dilaton profile is
mapped to a theory with non-conformal matter although its leading asymptotic
geometry still remains as AdS space.Comment: 24 pages, references adde
Holographic aspects of a relativistic non-conformal theory
We study a general D-dimensional Schwarzschild-type black brane solution of
the Einstein-dilaton theory and derive, by using the holographic
renormalization, its thermodynamics consistent with the geometric results.
Using the membrane paradigm, we calculate the several hydrodynamic transport
coefficients and compare them with the results obtained by the Kubo formula,
which shows the self-consistency of the gauge/gravity duality in the
relativistic non-conformal theory. In order to understand more about the
relativistic non-conformal theory, we further investigate the binding energy,
drag force and holographic entanglement entropy of the relativistic
non-conformal theory.Comment: 29 pages, 4 figures, title changed, references adde
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