期刊
PHYSICAL REVIEW D
卷 96, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.063507
关键词
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资金
- U.K. Science and Technology Facilities Council [ST/J001546/1]
- Estonian Research Council [IUT23-6]
- ERDF Centre of Excellence Project [TK133]
We study production of primordial black holes (PBHs) during an early matter-dominated phase. As a source of perturbations, we consider either an inflaton field with a running spectral index or a spectator field that has a blue spectrum and thus provides a significant contribution to 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, dn/d ln k less than or similar to 0.001, which are comparable to those from the Planck satellite for a scenario where the spectator field is absent.
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