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
Full text not available from this repository.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.