http://arxiv.org/abs/1906.03942
A scalar field rolling down a potential with a large initial velocity results in inflation of a finite duration. Such a scenario suppresses the scalar power on large scales improving the fit to the cosmological data. We find that the scenario leads to a hitherto unexplored situation wherein the boundary terms dominate the contributions to the scalar bispectrum over the bulk terms. We show that the consistency relation governing the non-Gaussianity parameter $f_{{\rm NL}}$ is violated on large scales and that the contributions at the initial time can substantially enhance the value of $f{_{\rm NL}}$.
H. Ragavendra, D. Chowdhury and L. Sriramkumar
Tue, 11 Jun 19
5/60
Comments: v1: 5 pages, 4 figures
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