Prospects of detection of subsolar mass primordial black hole and white dwarf binary mergers
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| Format: | Preprint |
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2023
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| _version_ | 1866917557688074240 |
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| author | Yamamoto, Takahiro S. Inui, Ryoto Tada, Yuichiro Yokoyama, Shuichiro |
| author_facet | Yamamoto, Takahiro S. Inui, Ryoto Tada, Yuichiro Yokoyama, Shuichiro |
| contents | The subsolar mass primordial black hole (PBH) attracts attention as robust evidence of its primordial origin against the astrophysical black hole. Not only with themselves, PBHs can also form binaries with ordinary astrophysical objects, catching them by gravitational wave (GW) bremsstrahlung. We discuss the detectability of the inspiral GWs from binaries consisting of a PBH and a white dwarf (WD) by using space-borne gravitational wave interferometers like DECIGO. The conservative assessment shows the expected event number in three years by DECIGO is $\mathcal{O}(10^{-6})$ for $M_\mathrm{PBH} \sim 0.1M_\odot$. Possible enhancement mechanisms of WD-PBH binary formation may amplify this event rate. We discuss how large enhancement associated with WDs is required to detect WD-PBH merger events without violating the existing constraints on the PBH-PBH merger by the ground-based detector. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_00044 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Prospects of detection of subsolar mass primordial black hole and white dwarf binary mergers Yamamoto, Takahiro S. Inui, Ryoto Tada, Yuichiro Yokoyama, Shuichiro General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics The subsolar mass primordial black hole (PBH) attracts attention as robust evidence of its primordial origin against the astrophysical black hole. Not only with themselves, PBHs can also form binaries with ordinary astrophysical objects, catching them by gravitational wave (GW) bremsstrahlung. We discuss the detectability of the inspiral GWs from binaries consisting of a PBH and a white dwarf (WD) by using space-borne gravitational wave interferometers like DECIGO. The conservative assessment shows the expected event number in three years by DECIGO is $\mathcal{O}(10^{-6})$ for $M_\mathrm{PBH} \sim 0.1M_\odot$. Possible enhancement mechanisms of WD-PBH binary formation may amplify this event rate. We discuss how large enhancement associated with WDs is required to detect WD-PBH merger events without violating the existing constraints on the PBH-PBH merger by the ground-based detector. |
| title | Prospects of detection of subsolar mass primordial black hole and white dwarf binary mergers |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2401.00044 |