Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single scale factor for the universe from the creation of radiation and
  matter till the present   A scheme for incorporating the creation of radiation and matter into the
cosmological evolution is introduced so that it becomes possible to merge the
times before and after the creation of radiation and matter in a single scale
factor in Robertson-Walker metric. This scheme is illustrated through a toy
model that has the prospect of constituting a basis for a realistic model.

34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex