3 papers
astro-ph.CO2020
Could PBHs and secondary GWs have originated from squeezed initial states?
H. V. Ragavendra, L. Sriramkumar, Joseph Silk
[Abridged] Recently, the production of primordial black holes (PBHs) and secondary gravitational waves (GWs) due to enhanced scalar power on small scales have garnered considerable…
astro-ph.CO2020
PBHs and secondary GWs from ultra slow roll and punctuated inflation
H. V. Ragavendra, Pankaj Saha, L. Sriramkumar +1
[Abridged] The primordial scalar power spectrum is well constrained on large scales, primarily by the observations of the anisotropies in the cosmic microwave background (CMB). Ove…
astro-ph.CO2019
Unique contributions to the scalar bispectrum in `just enough inflation'
H. V. Ragavendra, Debika Chowdhury, L. Sriramkumar
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 improvi…