Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective holographic models for QCD: Thermodynamics and viscosity
  coefficients   A finite temperature extension of the effective holographic models for QCD
(EHQCD), proposed in Ref.[1], is investigated in the present work. EHQCD models
are characterized by two parameters, the conformal dimension of the relevant
operator that deforms the CFT and the associated coupling. We find that black
hole solutions appear at temperatures higher than some temperature $T_{min}$
and can be categorized in two classes: large and small black holes. A large
black hole is thermally stable and it is therefore interpreted as the gravity
dual of a non-conformal plasma. A small black hole, on the other hand, is
thermally unstable. We show that thermodynamic quantities such as the entropy
density $s$, specific heat $C_V$, and speed of sound $c_s$ are sensitive to the
model parameters. We investigate perturbations of the black hole solutions and
calculate the viscosity coefficients of the corresponding dual non-conformal
plasma. For the shear viscosity, we confirm that the ratio $\eta/s$ is given by
the universal result $1/4\pi$. For the bulk viscosity, the ratio $\zeta/s$
varies with the temperature, displaying a rapid growth close to $T_{min}$, and
it is sensitive to the model parameters. We compare our results for the
thermodynamic quantities with the lattice $SU(N_C)$ results and find that they
are compatible as long as the coupling is fixed appropriately as a function of
the conformal dimension. We also compare our results for the viscosity
coefficients against the JETSCAPE results that are obtained from the analysis
of experimental data on heavy ion collisions.

4
The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph