A1 Journal article (refereed)
Shining primordial black holes (2021)

Hertzberg, M. P., Nurmi, S., Schiappacasse, E. D., & Yanagida, T. T. (2021). Shining primordial black holes. Physical Review D, 103(6), Article 063025. https://doi.org/10.1103/PhysRevD.103.063025

JYU authors or editors

Publication details

All authors or editors: Hertzberg, Mark P.; Nurmi, Sami; Schiappacasse, Enrico D.; Yanagida, Tsutomu T.

Journal or series: Physical Review D

ISSN: 2470-0010

eISSN: 2470-0029

Publication year: 2021

Volume: 103

Issue number: 6

Article number: 063025

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevD.103.063025

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/74882

Publication is parallel published: https://arxiv.org/abs/2011.05922

Abstract

We study the well-motivated mixed dark matter (DM) scenario composed of a dominant thermal WIMP, highlighting the case of SU(2)L triplet fermion “winos,” with a small fraction of primordial black holes (PBHs). After the wino kinetic decoupling, the DM particles are captured by PBHs leading to the presence of PBHs with dark minihalos in the Milky Way today. The strongest constraints for the wino DM come from the production of narrow line gamma rays from wino annihilation in the Galactic Center. We analyse in detail the viability of the mixed wino DM scenario, and determine the constraints on the fraction of DM in PBHs assuming a cored halo profile in the Milky Way. We show that already with the sensitivity of current indirect searches, there is a significant probability for detecting a gamma ray signal characteristic for the wino annihilation in a single nearby dressed PBH when MPBH∼M⊙, which we refer to as a “shining black hole.” Similar results should apply also in more general setups with ultracompact minihalos or other DM models, since the accretion of DM around large overdensities and DM annihilation are both quite generic processes.

Keywords: cosmology; astrophysics; dark matter; black holes

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Ministry reporting: Yes

Reporting Year: 2021

JUFO rating: 2