The Stochastic Gravitational Wave Background from Primordial Gravitational Atoms
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866908383054921728 |
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| author | Kang, Zhaofeng Li, Tianjun Ye, Weitao |
| author_facet | Kang, Zhaofeng Li, Tianjun Ye, Weitao |
| contents | We propose a scenario of primordial gravitational atoms (PGAs), which may exist in the current and past universe due to spinning primordial black holes (PBHs) and very light bosonic fields. In a monochromatic mass scenario with a sizable dimensionless spin, which may arise in a short matter dominated (MD) era, we analyze the resulting stochastic gravitational wave background (SGWB) signal. Its spectrum is approximately characterized by a rising $\propto f^3$ followed by a falling $\propto f^{-1}$ where $f$ is the frequency. Then, we investigate the constraints and prospects of such a SGWB, and find that PGAs with a core mass $M_{\rm BH}\sim {\cal O}(10)~M_{\odot}$ and a cloud of light scalar with mass $μ\sim {\cal O} (10^{-13})$ eV could yield constraints even stronger than those from bare PBHs. Future detectors such as LISA, Taiji and TianQin are able to explore PGAs over a narrow and elongated strap in the $(μ,M_{\rm BH})$ plane, spanning over 10 orders of magnitude for the maximum spin, $10^{-8}~M_{\odot}\lesssim M_{\rm BH}\lesssim 10^4~M_{\odot}$, $10^{-16}~{\rm eV}\lesssim μ\lesssim 10^{-3}~\rm eV$. If the PGA is dressed with a vector cloud, the SGWB signal has a much better opportunity to be probed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_13385 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Stochastic Gravitational Wave Background from Primordial Gravitational Atoms Kang, Zhaofeng Li, Tianjun Ye, Weitao High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We propose a scenario of primordial gravitational atoms (PGAs), which may exist in the current and past universe due to spinning primordial black holes (PBHs) and very light bosonic fields. In a monochromatic mass scenario with a sizable dimensionless spin, which may arise in a short matter dominated (MD) era, we analyze the resulting stochastic gravitational wave background (SGWB) signal. Its spectrum is approximately characterized by a rising $\propto f^3$ followed by a falling $\propto f^{-1}$ where $f$ is the frequency. Then, we investigate the constraints and prospects of such a SGWB, and find that PGAs with a core mass $M_{\rm BH}\sim {\cal O}(10)~M_{\odot}$ and a cloud of light scalar with mass $μ\sim {\cal O} (10^{-13})$ eV could yield constraints even stronger than those from bare PBHs. Future detectors such as LISA, Taiji and TianQin are able to explore PGAs over a narrow and elongated strap in the $(μ,M_{\rm BH})$ plane, spanning over 10 orders of magnitude for the maximum spin, $10^{-8}~M_{\odot}\lesssim M_{\rm BH}\lesssim 10^4~M_{\odot}$, $10^{-16}~{\rm eV}\lesssim μ\lesssim 10^{-3}~\rm eV$. If the PGA is dressed with a vector cloud, the SGWB signal has a much better opportunity to be probed. |
| title | The Stochastic Gravitational Wave Background from Primordial Gravitational Atoms |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2407.13385 |