Primordial black holes from inflaton and spectator field perturbations in a matter-dominated era
arXiv:1706.03746 · doi:10.1103/PhysRevD.96.063507
Abstract
We study production of primordial black holes (PBHs) during an early matter-dominated phase. As a source of perturbations, we consider either the inflaton field with a running spectral index or a spectator field that has a blue spectrum and thus provides a significant contribution to the PBH production at small scales. First, we identify the region of the parameter space where a significant fraction of the observed dark matter can be produced, taking into account all current PBH constraints. Then, we present constraints on the amplitude and spectral index of the spectator field as a function of the reheating temperature. We also derive constraints on the running of the inflaton spectral index, , which are comparable to those from the Planck satellite for a scenario where the spectator field is absent.
arXiv comment10 pages, 7 figures. v2: Minor changes to v1, accepted for publication in Phys. Rev. D
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