Scale Invariance without Inflation?

Details Scale Invariance without Inflation? Scale Invariance without Inflation?

2003-07-07

arxiv.org/abs/astro-ph/0307101v2

JCAP 0312:002,2003

Astronomy and Astrophysics

Astrophysics

6 two-column pages, 1 figure. Uses RevTeX4. v2: References added and number of required e-folds refined

Scientific paper

10.1088/1475-7516/2003/12/002

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.

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