We derive constraints on mixed dark-matter scenarios consisting of primordial black holes (PBHs) and weakly interacting massive particles (WIMPs). In these scenarios, we expect a density spike of the WIMPs that are gravitationally bound to the PBHs, which results in an enhanced annihilation rate and increased indirect detection prospects. We show that such scenarios provide strong constraints on the allowed fraction of PBHs that constitutes the dark matter, depending on the WIMP mass mχ and the velocity-averaged annihilation cross-section σv. For the standard scenario with mχ = 100 GeV and σv = 3 × 10-26 cm3/s, we derive bounds that are stronger than all existing bounds for PBHs with masses 10-12 Mo MBH 104 Mo, where Mo is the solar mass, and mostly so by several orders of magnitude.
Novel constraints on mixed dark-matter scenarios of primordial black holes and WIMPs
Visinelli L.
Writing – Original Draft Preparation
2018
Abstract
We derive constraints on mixed dark-matter scenarios consisting of primordial black holes (PBHs) and weakly interacting massive particles (WIMPs). In these scenarios, we expect a density spike of the WIMPs that are gravitationally bound to the PBHs, which results in an enhanced annihilation rate and increased indirect detection prospects. We show that such scenarios provide strong constraints on the allowed fraction of PBHs that constitutes the dark matter, depending on the WIMP mass mχ and the velocity-averaged annihilation cross-section σv. For the standard scenario with mχ = 100 GeV and σv = 3 × 10-26 cm3/s, we derive bounds that are stronger than all existing bounds for PBHs with masses 10-12 Mo MBH 104 Mo, where Mo is the solar mass, and mostly so by several orders of magnitude.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
