Influence of large local and non-local bispectra on primordial black hole abundance

Understand

Primordial black holes represent a unique probe to constrain the early universe on small scales - providing the only constraints on the primordial power spectrum on the majority of scales.

• However, these constraints are strongly dependent on even small amounts of non-Gaussianity, which is unconstrained on scales significantly smaller than those visible in the CMB.
• This paper goes beyond previous considerations to consider the effects of a bispectrum of the equilateral, orthogonal and local shapes with arbitrary magnitude upon the abundance of primordial black holes.
• Non-Gaussian density maps of the early universe are generated from a given bispectrum and used to place constraints on the small scale power spectrum.