Stable bounce and inflation in non-local higher derivative cosmology

Biswas, Tirthabir and S. Koshelev, Alexey and Mazumdar, Anupam and Yu. Vernov, Sergey (2012) Stable bounce and inflation in non-local higher derivative cosmology. Journal of Cosmology and Astroparticle Physics, 2012 (8). ISSN 1475-7516

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Abstract

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.

Item Type: Journal Article
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Additional Information: 24 pages, uses jcappub.sty; v2: version matching the one published in JCAP, some clarifications added
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3103
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63446
Deposited By: ep_importer_pure
Deposited On: 19 Apr 2013 08:53
Refereed?: Yes
Published?: Published
Last Modified: 11 Feb 2020 08:08
URI: https://eprints.lancs.ac.uk/id/eprint/63446

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