Primordial Black Hole Mergers as Probes of Dark Matter in the Galactic Center
Primordial black holes (PBHs) from the early Universe that can contribute to dark matter (DM) abundance have been linked to gravitational-wave observations. Supermassive black holes at the centers of galaxies are expected to modify the distribution of DM in their vicinity and can result in highly co...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adaeb4 |
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| author | Qianhang Ding Minxi He Volodymyr Takhistov |
| author_facet | Qianhang Ding Minxi He Volodymyr Takhistov |
| author_sort | Qianhang Ding |
| collection | DOAJ |
| description | Primordial black holes (PBHs) from the early Universe that can contribute to dark matter (DM) abundance have been linked to gravitational-wave observations. Supermassive black holes at the centers of galaxies are expected to modify the distribution of DM in their vicinity and can result in highly concentrated DM spikes. We revisit PBH merger rates in the presence of DM spikes, tracking their history. We find novel peaked structure in the redshift evolution of PBH merger rates at low redshifts around z ∼ 5. These effects are generic and are present for distinct PBH mass functions and spike profiles, and also can be linked to peaked structure in the redshift evolution of the star formation rate. Redshift evolution characteristics of PBH merger rates can be distinguished from astrophysical black hole contributions and observable with gravitational waves, enabling them to serve as probes of DM in galactic centers. |
| format | Article |
| id | doaj-art-d5d0e0db474446afbe2260b2963350cd |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-d5d0e0db474446afbe2260b2963350cd2025-08-20T02:03:35ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198116210.3847/1538-4357/adaeb4Primordial Black Hole Mergers as Probes of Dark Matter in the Galactic CenterQianhang Ding0https://orcid.org/0000-0001-6703-2531Minxi He1https://orcid.org/0000-0002-2480-6848Volodymyr Takhistov2https://orcid.org/0000-0003-2647-3431Cosmology, Gravity and Astroparticle Physics Group, Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS) , Daejeon 34126, Republic of Korea ; dingqh@ibs.re.krParticle Theory and Cosmology Group, Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS) , Daejeon 34126, Republic of Korea ; heminxi@ibs.re.krInternational Center for Quantum-field Measurement Systems for Studies of the Universe and Particles (QUP) , High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan ; vtakhist@post.kek.jp; Theory Center, Institute of Particle and Nuclear Studies (IPNS) , High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan; Graduate University for Advanced Studies (SOKENDAI) , 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan; Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS, The University of Tokyo , Kashiwa, Chiba 277-8583, JapanPrimordial black holes (PBHs) from the early Universe that can contribute to dark matter (DM) abundance have been linked to gravitational-wave observations. Supermassive black holes at the centers of galaxies are expected to modify the distribution of DM in their vicinity and can result in highly concentrated DM spikes. We revisit PBH merger rates in the presence of DM spikes, tracking their history. We find novel peaked structure in the redshift evolution of PBH merger rates at low redshifts around z ∼ 5. These effects are generic and are present for distinct PBH mass functions and spike profiles, and also can be linked to peaked structure in the redshift evolution of the star formation rate. Redshift evolution characteristics of PBH merger rates can be distinguished from astrophysical black hole contributions and observable with gravitational waves, enabling them to serve as probes of DM in galactic centers.https://doi.org/10.3847/1538-4357/adaeb4Primordial black holesGalaxy dark matter halosGravitational waves |
| spellingShingle | Qianhang Ding Minxi He Volodymyr Takhistov Primordial Black Hole Mergers as Probes of Dark Matter in the Galactic Center The Astrophysical Journal Primordial black holes Galaxy dark matter halos Gravitational waves |
| title | Primordial Black Hole Mergers as Probes of Dark Matter in the Galactic Center |
| title_full | Primordial Black Hole Mergers as Probes of Dark Matter in the Galactic Center |
| title_fullStr | Primordial Black Hole Mergers as Probes of Dark Matter in the Galactic Center |
| title_full_unstemmed | Primordial Black Hole Mergers as Probes of Dark Matter in the Galactic Center |
| title_short | Primordial Black Hole Mergers as Probes of Dark Matter in the Galactic Center |
| title_sort | primordial black hole mergers as probes of dark matter in the galactic center |
| topic | Primordial black holes Galaxy dark matter halos Gravitational waves |
| url | https://doi.org/10.3847/1538-4357/adaeb4 |
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