Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmology with bulk pressure   Different cooling rates of interacting fluid components of the expanding
cosmic medium give rise to entropy producing bulk stresses. With the help of
effective bulk pressures, on the other hand, one may phenomenologically take
into account cosmological particle production processes. We report on recent
progress in bulk viscous cosmology both on the phenomenological level and on
the level of relativistic kinetic theory.

23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
1
The categories of this paper are: cs