Wednesday, April 10, 2013

1304.2291 (Giovanni Marozzi et al.)

Gauge invariant backreaction in general single field models of inflation    [PDF]

Giovanni Marozzi, Gian Paolo Vacca
In a general single field inflationary model we consider the effects of long wavelength scalar fluctuations on the effective expansion rate and equation of state seen by a class of free falling observers, using a physical gauge invariant formulation. In a previous work we showed that for a free massive inflaton no backreaction is observed within some constraints. In this note we extend the validity of our previous results to the case of an arbitrary self-interacting inflation potential, working to second order in cosmological perturbation theory and to all order in slow-roll approximation. For these general inflationary models, we also show the equivalence of the free falling observers to the ones comoving with the inflaton field.
View original: http://arxiv.org/abs/1304.2291

No comments:

Post a Comment