Generation of Primordial Black Holes from inflation model with modified dispersion relation 后印本

摘要: Primordial black hole (PBHs) is interesting to people for its ability of explaining dark matter as well as supermassive astrophysical objects. In normal inflation scenario, the generation of PBHs usually requires enhanced power spectrum of scalar perturbation at the end of inflation era, which is expected when the dispersion relation of the inflaton field gets modified. In this work, we study a kind of inflation model called "{\it DBI-inspired non-minimal kinetic coupling" (DINKIC)} model, where the dispersion relation is modified by a square root existing in the field Lagrangian. We discuss the enhancement of scalar power spectrum due to the modified dispersion relation, as well as the abundance of PBHs produced by the Press-Schechter collapse mechanism. We also discuss the formation of Scalar-Induced Gravitational Waves (SIGWs) by linear scalar perturbations.