Near Scale Invariance with Modified Dispersion Relations

Details Near Scale Invariance with Modified Dispersion Relations Near Scale Invariance with Modified Dispersion Relations

2006-06-07

arxiv.org/abs/astro-ph/0606168v1

JCAP 0610 (2006) 010

Astronomy and Astrophysics

Astrophysics

7 pages and no figures. Uses RevTeX4

Scientific paper

10.1088/1475-7516/2006/10/010

We describe a novel mechanism to seed a nearly scale invariant spectrum of adiabatic perturbations during a non-inflationary stage. It relies on a modified dispersion relation that contains higher powers of the spatial momentum of matter perturbations. We implement this idea in the context of a massless scalar field in an otherwise perfectly homogeneous universe. The couplings of the field to background scalars and tensors give rise to the required modification of its dispersion relation, and the couplings of the scalar to matter result in an adiabatic primordial spectrum. This work is meant to explicitly illustrate that it is possible to seed nearly scale invariant primordial spectra without inflation, within a conventional expansion history.

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