Super-Horizon Scale Dynamics of Multi-Scalar Inflation

Details Super-Horizon Scale Dynamics of Multi-Scalar Inflation Super-Horizon Scale Dynamics of Multi-Scalar Inflation

1998-01-08

arxiv.org/abs/gr-qc/9801017v2

Prog.Theor.Phys.99:763-782,1998

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, typos corrected, to be published in Prog. Theor. Phys. 99 (1998)

Scientific paper

10.1143/PTP.99.763

We consider the dynamics of a multi-component scalar field on super-horizon scales in the context of inflationary cosmology. We present a method to solve the perturbation equations on super- horizon scales, i.e., in the long wavelength limit, by using only the knowledge of spatially homogeneous background solutions. In doing so, we clarify the relation between the perturbation equations in the long wavelength limit and the background equations. Then as a natural extension of our formalism, we provide a strategy to study super-horizon scale perturbations beyond the standard linear perturbation theory. Namely we reformulate our method so as to take into account the nonlinear dynamics of the scalar field.

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