Backreaction during inflation: a physical gauge invariant formulation
Abstract
Within a genuinely gauge invariant approach recently developed for the computation of the cosmological backreaction, we study, in a cosmological inflationary context and with respect to various observers, the impact of scalar fluctuations on the space-time dynamics in the long wavelength limit. We stress that such a quantum backreaction effect is evaluated in a truly gauge independent way using a set of effective equations which describe the dynamics of the averaged geometry. In particular we show under what conditions the free falling (geodetic) observers do not experience any scalar-induced backreaction in the effective Hubble rate and fluid equation of state.
Cite
@article{arxiv.1101.1051,
title = {Backreaction during inflation: a physical gauge invariant formulation},
author = {F. Finelli and G. Marozzi and G. P. Vacca and G. Venturi},
journal= {arXiv preprint arXiv:1101.1051},
year = {2011}
}
Comments
4 pages. Typos corrected, comment added, version accepted for publication in Phys. Rev. Lett