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Application of gradient expansion to an inflationary universe

Yasusada Nambu and Atsushi Taruya

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Using the long-wave perturbation scheme (gradient expansion), the effect of inhomogeneity on the inflationary phase is investigated. We have solved the perturbation equation whose source term comes from inhomogeneity of a scalar field and a seed metric. The result indicates that a sub-horizon scale inhomogeneity strongly affects the onset of inflation.


PACS

98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)

04.25.-g Approximation methods; equations of motion

04.20.-q Classical general relativity

MSC

83C10 Equations of motion

83F05 Cosmology

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 4 (April 1996)

Received 5 June 1995, in final form 9 February 1996



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