Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A model for the very early Universe   A model with N species of massless fermions interacting via (microscopic)
gravitational torsion in de Sitter spacetime is investigated in the limit
N->infinity. The U_V(N)*U_A(N) flavor symmetry is broken dynamically
irrespective of the (positive) value of the induced four-fermion coupling. This
model is equivalent to a theory with free but massive fermions fluctuating
about the chiral condensate. When the fermions are integrated out in a way
demonstrated long ago by Candelas and Raine, the associated gap equation
together with the Friedmann equation predict that the Hubble parameter
vanishes. Introducing a matter sector (subject to a finite gauge symmetry) as a
source for subsequent cosmology, the neutral Goldstone field acquires mass by
the chiral anomaly, resulting in a Planck-scale axion.

4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys