Test Gravitational-Wave Polarizations with Space-Based Detectors
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913872343990272 |
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| author | Wang, Jun-Shuai Liu, Chang Chen, Ju He, Jibo |
| author_facet | Wang, Jun-Shuai Liu, Chang Chen, Ju He, Jibo |
| contents | In this work, we systematically investigate the capability of space-based gravitational wave detectors in constraining parameters of non-tensor polarization modes. Using Bayesian inference and Fisher Information Matrix methods, we analyze gravitational wave signals from the inspiral phase of supermassive binary black hole mergers. By starting with time-domain signals and applying Fourier transforms, we avoid the use of the stationary phase approximation. We found an asymmetry in the estimation of the vector-mode parameter $α_x$ at inclination angles $ι= 0$ and $ι= π$, which has not been explicitly pointed out in previous studies. We also observe strong correlations between scalar-mode parameters, $α_b$ and $α_l$, which currently limit their independent estimation. These findings underscore the importance of using complete inspiral-merger-ringdown waveforms to enhance the ability to distinguish the non-tensor polarization modes. Finally, we employ a new LISA-Taiji network configuration, in which the orientation of spacecrafts of Taiji maintains a fixed phase offset relative to these of LISA. Under the adiabatic approximation and the assumption of equal arms, this phase is found to have no significant effect on data analysis. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_02909 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Test Gravitational-Wave Polarizations with Space-Based Detectors Wang, Jun-Shuai Liu, Chang Chen, Ju He, Jibo General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena In this work, we systematically investigate the capability of space-based gravitational wave detectors in constraining parameters of non-tensor polarization modes. Using Bayesian inference and Fisher Information Matrix methods, we analyze gravitational wave signals from the inspiral phase of supermassive binary black hole mergers. By starting with time-domain signals and applying Fourier transforms, we avoid the use of the stationary phase approximation. We found an asymmetry in the estimation of the vector-mode parameter $α_x$ at inclination angles $ι= 0$ and $ι= π$, which has not been explicitly pointed out in previous studies. We also observe strong correlations between scalar-mode parameters, $α_b$ and $α_l$, which currently limit their independent estimation. These findings underscore the importance of using complete inspiral-merger-ringdown waveforms to enhance the ability to distinguish the non-tensor polarization modes. Finally, we employ a new LISA-Taiji network configuration, in which the orientation of spacecrafts of Taiji maintains a fixed phase offset relative to these of LISA. Under the adiabatic approximation and the assumption of equal arms, this phase is found to have no significant effect on data analysis. |
| title | Test Gravitational-Wave Polarizations with Space-Based Detectors |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2506.02909 |