Detecting axionlike particles with primordial black holes - INSPIRE

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Detecting axionlike particles with primordial black holes

Kaustubh Agashe
(
- Maryland U.
)
,
Jae Hyeok Chang
(
- Maryland U. and
- Johns Hopkins U.
)
,
Steven J. Clark
(
- Brown U. and
- Maryland U.
)
,
Bhaskar Dutta
(
- Texas A-M
)
,
Yuhsin Tsai
(
- Notre Dame U.
)

Dec 22, 2022

8 pages

Published in:

Phys.Rev.D 108 (2023) 2, 023014

Published: Jul 14, 2023

e-Print:

2212.11980 [hep-ph]

DOI:

10.1103/PhysRevD.108.023014 (publication)

Report number:

UMD-PP-022-12,
MI-HET-792

View in:

ADS Abstract Service

reference search19 citations

Citations per year

Abstract: (APS)

Future gamma-ray experiments, such as the e-ASTROGAM and AMEGO telescopes, can detect the Hawking radiation of photons from primordial black holes (PBHs) if they make up a fraction or all of dark matter. PBHs can analogously also Hawking radiate new particles, which is especially interesting if these particles are mostly secluded from the Standard Model sector, since they might therefore be less accessible otherwise. A well-motivated example of this type is axionlike particles (ALPs) with a tiny coupling to photons. We assume that the ALPs produced by PBHs decay into photons well before reaching the Earth, so these will augment the photons directly radiated by the PBHs. Remarkably, we find that the peaks in the energy distributions of ALPs produced from PBHs are different than the corresponding ones for Hawking radiated photons due to the spin-dependent graybody factor. Therefore, we demonstrate that this process will in fact distinctively modify the PBHs’ gamma-ray spectrum relative to the Standard Model prediction. We use monochromatic asteroid-mass PBHs as an example to show that e-ASTROGAM can observe the PBH-produced ALP gamma-ray signal (for masses up to

\sim 60 MeV

) and further distinguish it from Hawking radiation without ALPs. By measuring the gamma-ray signals, e-ASTROGAM can thereby probe yet unexplored parameters in the ALP mass and photon coupling.

Note:

8 pages + references, 5 figures

radiation: Hawking
black hole: primordial
photon: coupling
up: mass
photon: radiation
spin: dependence
gamma ray: emission
axion-like particles
dark matter: density
new particle

References(161)

Figures(7)

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