Can tensor-scalar induced GWs dominate PTA observations ?
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866908289549205504 |
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| author | Wu, Di Zhou, Jing-Zhi Kuang, Yu-Ting Li, Zhi-Chao Chang, Zhe Huang, Qing-Guo |
| author_facet | Wu, Di Zhou, Jing-Zhi Kuang, Yu-Ting Li, Zhi-Chao Chang, Zhe Huang, Qing-Guo |
| contents | Observational constraints on small-scale primordial gravitational waves are considerably weaker than those on large scales. We focus on scenarios with significant primordial gravitational waves and curvature perturbations on small scales, studying the energy density spectrum of the second-order TSIGW. By leveraging current data from CMB, BAO, and PTA, combined with the SNR analysis of LISA, we can investigate how tensor-scalar induced gravitational waves affect observations on various scales, thus constraining the parameter space for primordial gravitational waves and curvature perturbations. The Bayes factor analysis suggests that TSIGW+PGW might be more likely to dominate current PTA observations compared to SMBHB. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_00228 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Can tensor-scalar induced GWs dominate PTA observations ? Wu, Di Zhou, Jing-Zhi Kuang, Yu-Ting Li, Zhi-Chao Chang, Zhe Huang, Qing-Guo Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Theory Observational constraints on small-scale primordial gravitational waves are considerably weaker than those on large scales. We focus on scenarios with significant primordial gravitational waves and curvature perturbations on small scales, studying the energy density spectrum of the second-order TSIGW. By leveraging current data from CMB, BAO, and PTA, combined with the SNR analysis of LISA, we can investigate how tensor-scalar induced gravitational waves affect observations on various scales, thus constraining the parameter space for primordial gravitational waves and curvature perturbations. The Bayes factor analysis suggests that TSIGW+PGW might be more likely to dominate current PTA observations compared to SMBHB. |
| title | Can tensor-scalar induced GWs dominate PTA observations ? |
| topic | Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2501.00228 |