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Stable bounce and inflation in non-local higher derivative cosmology

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number024
<mark>Journal publication date</mark>22/08/2012
<mark>Journal</mark>Journal of Cosmology and Astroparticle Physics
Issue number8
Publication StatusPublished
<mark>Original language</mark>English


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.

Bibliographic note

24 pages, uses jcappub.sty; v2: version matching the one published in JCAP, some clarifications added