Small scale signatures of non-trivial inflationary and post-inflationary dynamics

Webinar:- Small scale signatures of non-trivial inflationary and post-inflationary dynamics

The primordial scalar power spectrum is well constrained over large scales, essentially by the observations of the anisotropies in the cosmic microwave background. However, the current bounds on the scalar power spectrum over small scales are considerably weaker. During the last few years, there has been an interest in examining scenarios which generate enhanced scalar power on small scales and lead to significant production of primordial black holes as well as induce secondary gravitational waves(GWs) of possibly detectable amplitudes. In this talk, the speaker will first outline some of the inflationary scenarios his team have examined in this context. Thereafter, he will describe the scalar bispectrum arising in such scenarios in single field models of inflation and discuss the corresponding imprints on the spectral density of secondary GWs. The speaker will then illustrate the difficulty in generating enhanced power on small scales from squeezed initial states. Lastly, he will highlight the manner in which non-trivial post-inflationary dynamics can leave telltale imprints on the spectral density of primary GWs at small scales.

時間:2021.08.31(二) 21:00~22:20
講者:Lakshmanan Sriramkumar(Indian Inst. of Tech., Madras)

※May participant write to [email protected] to request for meeting link.


“Copernicus Webinar and Colloquium Series”: To promote scientific discussions during this pandemic, they are organizing an online seminar series, i.e. Copernicus Webinar Series, seeking the most outstanding speakers to introduce innovative ideas and important progress in the field of gravity and cosmology. This series is named after the famous Polish Astronomer, Nicolaus Copernicus, whose discovery eventually marked the dawn of modern science.


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