Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inflation and Cosmological Constant   In construction of an inflationary model, one usually assumes that the matter
sector of the gravitational action is minimally coupled to the background. It
means that the matter (inflaton) part of the action is coupled with the same
metric of the gravitational part. We elaborate on this assumption and
investigate some of the consequences. We assume that the gravitational and the
inflaton sectors belong to different units (or conformal frames). We show that
this coupling can convert a single-field inflationary model into a two-field
one with a mixed kinetic term. The energy-momentum tensor of the inflaton is
therefore non-conserved due to the interaction with the conformal factor. This
allows an energy exchange between the two fields and provides us with a
mechanism for reduction of a large effective cosmological constant during
inflation.

18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin