Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A class of homogeneous scalar-tensor cosmologies with a radiation fluid   We present a new class of exact homogeneous cosmological solutions with a
radiation fluid for all scalar-tensor theories. The solutions belong to Bianchi
type $VI_{h}$ cosmologies. Explicit examples of nonsingular homogeneous
scalar-tensor cosmologies are also given.

22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess