Boundary Effects in Local Inflation and Spectrum of Density Perturbations

Details Boundary Effects in Local Inflation and Spectrum of Density Perturbations Boundary Effects in Local Inflation and Spectrum of Density Perturbations

2007-04-18

arxiv.org/abs/0704.2284v4

Gen.Rel.Grav.40:1511,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 8 figures, revtex4, v4: minor typos corrected, twocolumn version

Scientific paper

10.1007/s10714-007-0544-x

We observe that when a local patch in a radiation filled Robertson-Walker universe inflates by some reason, outside perturbations can enter into the inflating region. Generally, the physical wavelengths of these perturbations become larger than the Hubble radius as they cross into the inflating space and their amplitudes freeze out immediately. It turns out that the corresponding power spectrum is not scale invariant. Although these perturbations cannot reach out to a distance inner observer shielded by a de Sitter horizon, they still indicate a curious boundary effect in local inflationary scenarios.

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