Title

Scale Invariance without Inflation?

Author(s)/Creator(s)

Christian Armendariz-Picon, Syracuse UniversityFollow
Eugene A. Lim, University of Chicago

Document Type

Article

Date

9-4-2003

Language

English

Disciplines

Physics

Description/Abstract

We propose a new alternative mechanism to seed a scale invariant spectrum of primordial density perturbations that does not rely on inflation. In our scenario, a perfect fluid dominates the early stages of an expanding, non-inflating universe. Because the speed of sound of the fluid decays, perturbations are left frozen behind the sound horizon, with a spectral index that depends on the fluid equation of state. We explore here a toy model that realizes this idea. Although the model can explain an adiabatic, Gaussian, scale invariant spectrum of primordial perturbations, it turns out that in its simplest form it cannot account for the observed amplitude of the primordial density perturbations.

Additional Information

6 two-column pages, 1 figure. Uses RevTeX4. v2: References added and number of required e-folds refined More information at http://arxiv.org/abs/astro-ph/0307101

Recommended Citation

Armendariz-Picon, Christian and Lim, Eugene A., "Scale Invariance without Inflation?" (2003). Physics - All Scholarship. 231.
https://surface.syr.edu/phy/231

Source

Harvested from Arxiv.org

Creative Commons License

This work is licensed under a Creative Commons Attribution 3.0 License.