Stable bounce and inflation in non-local higher derivative cosmology

By Tirthabir Biswas, A. Koshelev, Anupam Mazumdar, S. Vernov. 2012

194 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/3c194dddcc0da2a240de2081b3f66ab14666178b

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Citations in the corpus

Towards understanding the ultraviolet behavior of quantum loops in infinite-derivative theories of gravity (2014, background): “So far, our studies involving certain classical cosmological backgrounds [21], have shown that the perturbations remain under control and do not show any instabilities.”