Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmological perturbation with two scalar fields in reheating after
  inflation   We investigate the cosmological perturbation of two-scalar field model during
the reheating phase after inflation. Using the exact solution of the
perturbation in long-wavelength limit, which is expressed in terms of the
background quantities, we analyze the behavior of the metric perturbation. The
oscillating inflaton field gives rise to the parametric resonance of the
massless scalar field and this leads to the amplification of the iso-curvature
mode of the metric perturbations.

19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio