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astro-ph2006★ 21 cited
Why should primordial perturbations be in a vacuum state?
C. Armendariz-Picon
In order to calculate the power spectrum generated during a stage of inflation, we have to specify the quantum state of the inflaton perturbations, which is conventionally assumed…
astro-ph2006★ 42 cited
Near Scale Invariance with Modified Dispersion Relations
C. Armendariz-Picon
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…