General relativistic effects on photon spectrum emitted from dark matter halos around primordial black holes
We investigate general relativistic effects on the photon spectrum emitted from decaying (or annihilating) particle dark matter in the halo surrounding a primordial black hole. The spectrum undergoes significant modification due to gravitational redshifts, which induces broadening as a result of the intense gravitational field near the black hole. This characteristic alteration in the photon spectrum presents a unique observational signature. Future observations of such spectral features may provide critical evidence for a mixed dark matter scenario, involving both primordial black holes and particle dark matter.
Authors
- Kazunori Kohri (ORCID: https://orcid.org/0000-0003-3764-8612)
- Takahisa Igata (ORCID: https://orcid.org/0000-0002-3344-9045)
- Tomoo Suzuki (ORCID: https://orcid.org/0000-0003-3329-8387)
- Tomohiro Harada (ORCID: https://orcid.org/0000-0002-9085-9905)
Institutions
- Rikkyo University (JP)
- High Energy Accelerator Research Organization (JP)
- Kavli Institute for the Physics and Mathematics of the Universe (JP)
- The Graduate University for Advanced Studies, SOKENDAI (JP)
- National Astronomical Observatory of Japan (JP)
- Gakushuin University (JP)
- The University of Tokyo (JP)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2025-06-09
- DOI
- https://doi.org/10.1103/vjp4-2pty
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Ministry of Education, Culture, Sports, Science and Technology
- Japan Society for the Promotion of Science