On Primordial Black Holes and secondary gravitational waves generated from inflation with solo/multi-bumpy potential

Understand

It is well known that a primordial black hole (PBH) can be generated in the inflation process of the early universe, especially when the inflation field has a number of non-trivial features that could break the slow-roll condition.

• In this study, we investigate a toy model of inflation with bumpy potential, which has one or several bumps.
• We determined that the potential with multi-bump can generate power spectra with multi-peaks in small-scale region, which can in turn predict the generation of primordial black holes in various mass ranges.
• We also consider the two possibilities of PBH formation by spherical and elliptical collapses.