Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A comment on the inhomogeneous Einstein-Cartan-Kalb-Ramond fields in
  Cosmology   Purely time dependent solutions in four-dimensional
Einstein-Cartan-Kalb-Ramond (ECKR) theory of gravity are shown not to be
possible leading to a trivial vanishing of all Kalb-Ramond fields. This result
seems to contradict previously results obtained by SenGupta et al. (Class. and
Quantum Gravity 19(2002)677) where de Sitter spacetime solution is found as an
example of opticaly active spacetime. It seems that only inhomogeneous KR
fields are possible in four-dimensional torsioned spacetimes.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin