Cosmological perturbation with two scalar fields in reheating after inflation

Details Cosmological perturbation with two scalar fields in reheating after inflation Cosmological perturbation with two scalar fields in reheating after inflation

1997-09-15

arxiv.org/abs/gr-qc/9709035v3

Phys.Lett.B428:37-43,1998

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages, 2 Encapsulated Postscript figures, revtex, references are added and type miss is corrected

Scientific paper

10.1016/S0370-2693(98)00378-5

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.

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