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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.04396 |
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| _version_ | 1866909980726132736 |
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| author | Shen, Ping Han, Wen-Biao Zhong, Wen-Xin |
| author_facet | Shen, Ping Han, Wen-Biao Zhong, Wen-Xin |
| contents | The origin of supermassive black holes (SMBHs) is a pivotal problem in modern cosmology. This work explores the potential of the Taiji-TianQin space-borne gravitational-wave (GW) detector network to identify the formation channels of massive black hole binaries (MBHBs) at high redshifts ($z \gtrsim 10$). The network substantially improves detection capability, boosting the signal-to-noise ratio by a factor of 2.2-3.0 (1.06-1.14) relative to TianQin (Taiji) alone. It increases the detection rate of MBHBs formed from light seeds (LS) by more than 2.2 times and achieves over 96\% detection efficiency for those originating from heavy seeds (HS). Furthermore, the network enables component mass estimation with relative uncertainties as low as $\sim 10^{-4}$ at the $2σ$ level. These improvements facilitate the assembly of a well-constrained population sample, allowing robust measurement of the fractional contributions from different formation pathways. The network achieves high precision in distinguishing between LS and HS origins (7.4\% relative uncertainty at $2σ$) and offers moderate discrimination between delay and no-delay channels in HS-origin binaries (24\%). However, classification remains challenging for delay versus no-delay scenarios in LS-origin systems (58\%) due to significant population overlap. In conclusion, the Taiji-TianQin network will serve as a powerful tool for unveiling the origins of SMBHs through GW population studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_04396 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revealing the origin of supermassive black holes with Taiji-TianQin network Shen, Ping Han, Wen-Biao Zhong, Wen-Xin General Relativity and Quantum Cosmology The origin of supermassive black holes (SMBHs) is a pivotal problem in modern cosmology. This work explores the potential of the Taiji-TianQin space-borne gravitational-wave (GW) detector network to identify the formation channels of massive black hole binaries (MBHBs) at high redshifts ($z \gtrsim 10$). The network substantially improves detection capability, boosting the signal-to-noise ratio by a factor of 2.2-3.0 (1.06-1.14) relative to TianQin (Taiji) alone. It increases the detection rate of MBHBs formed from light seeds (LS) by more than 2.2 times and achieves over 96\% detection efficiency for those originating from heavy seeds (HS). Furthermore, the network enables component mass estimation with relative uncertainties as low as $\sim 10^{-4}$ at the $2σ$ level. These improvements facilitate the assembly of a well-constrained population sample, allowing robust measurement of the fractional contributions from different formation pathways. The network achieves high precision in distinguishing between LS and HS origins (7.4\% relative uncertainty at $2σ$) and offers moderate discrimination between delay and no-delay channels in HS-origin binaries (24\%). However, classification remains challenging for delay versus no-delay scenarios in LS-origin systems (58\%) due to significant population overlap. In conclusion, the Taiji-TianQin network will serve as a powerful tool for unveiling the origins of SMBHs through GW population studies. |
| title | Revealing the origin of supermassive black holes with Taiji-TianQin network |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2509.04396 |