Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Second order causal hydrodynamics in Eckart frame: using gradient
  expansion scheme   In the present work, we develop a causal theory of relativistic non-ideal
fluids up to the second order in the Eckart frame using gradient expansion
scheme. Keeping the spirit of Mueller-Israel-Stewart formalism, the general
forms of bulk viscosity, shear viscosity tensor and the heat flow vector are
presented. Since each of the flux quantities explicitly carry curvature terms,
we show that our formalism finds application in astrophysics in particular in
the strong gravity regime. We elucidate two such applications namely in viscous
thick accretion disks also known as Polish doughnuts and in addressing
non-rotating equilibrium configuration, like neutron stars.

35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph