Stable bounce and inflation in non-local higher derivative cosmology

One of the greatest problems of primordial inflation is that the inflationary space-time is past-incomplete. This is mainly because Einstein's GR suffers from a space-like Big Bang singularity. It has recently been shown that ghost-free, non-local higher-derivative ultra-violet modifications of...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2012-08, Vol.2012 (8), p.i-24
Main Authors: Biswas, Tirthabir, Koshelev, Alexey S, Mazumdar, Anupam, Vernov, Sergey Yu
Format: Article
Language:English
Subjects:
Astronomical models
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGY
Derivatives
DISTURBANCES
GRAVITATION
Inflation
INFLATIONARY UNIVERSE
INFLATONS
MODIFICATIONS
Pathology
Perturbation methods
Singularities
SINGULARITY
SPACE-TIME
Trajectories
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Summary:One of the greatest problems of primordial inflation is that the inflationary space-time is past-incomplete. This is mainly because Einstein's GR suffers from a space-like Big Bang singularity. It has recently been shown that ghost-free, non-local higher-derivative ultra-violet modifications of Einstein's gravity may be able to resolve the cosmological Big Bang singularity via a non-singular bounce. Within the framework of such non-local cosmological models, we are going to study both sub- and super-Hubble perturbations around an inflationary trajectory which is preceded by the Big Bounce in the past, and demonstrate that the inflationary trajectory has an ultra-violet completion and that perturbations do not suffer from any pathologies.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2012/08/024