Isotropic observers and the inflationary backreaction problem

In an inflationary regime driven by a free massive inflaton, we consider a class of observers which sees an inhomogeneous and isotropic Universe and derive within a genuinely gauge invariant approach the backreaction effects due to long wavelength scalar fluctuations on the associated effective Hubb...

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Bibliographic Details
Published in:Classical and quantum gravity 2012-06, Vol.29 (11), p.115007-18
Main Authors: Marozzi, Giovanni, Vacca, Gian Paolo
Format: Article
Language:English
Subjects:
backreaction
cosmological perturbation theory
Equations of state
Exact sciences and technology
General relativity and gravitation
inflation
Invariants
Mathematical models
Observers
Physical properties
Physics
Quantum gravity
Retarding
Scalars
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Summary:In an inflationary regime driven by a free massive inflaton, we consider a class of observers which sees an inhomogeneous and isotropic Universe and derive within a genuinely gauge invariant approach the backreaction effects due to long wavelength scalar fluctuations on the associated effective Hubble factor and the equation of state. We find that, for such so-called isotropic observers, contrary to what happens for the observables defined by free-falling observers, there is an effect to leading order in the slow-roll parameter in the direction of slowing down the measured rate of expansion and of having an effective equation of state less de Sitter like. From a general point of view, the isotropic observers result has to be considered complementary to other cases (observers) in helping to characterize the physical properties of the models under investigation.
ISSN:0264-9381
1361-6382
DOI:10.1088/0264-9381/29/11/115007