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2020

PBHs and secondary GWs from ultra slow roll and punctuated inflation

Ragavendra, H. V., Saha, Pankaj, Sriramkumar, L. et al.

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[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).

Over the last few years, it has been recognized that a sharp rise in power on small scales will lead to enhanced formation of primordial black holes (PBHs) and also generate secondary gravitational waves (GWs) of higher and, possibly, detectable amplitudes.
It is well understood that scalar power spectra with COBE normalized amplitude on the CMB scales and enhanced amplitudes on smaller scales can be generated due to deviations from slow roll in single, canonical scalar field models of inflation.
In fact, an epoch of so-called ultra slow roll inflation can lead to the desired amplification.

PBHs and secondary GWs from ultra slow roll and punctuated inflation · Around

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