Spectrum of third-order tensor perturbations induced by excited scalar fields
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866908365095960576 |
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| author | Fang, Cheng-Jun Peng, Zhi-Zhang Hu, Han-Wen Guo, Zong-Kuan |
| author_facet | Fang, Cheng-Jun Peng, Zhi-Zhang Hu, Han-Wen Guo, Zong-Kuan |
| contents | We calculate for the first time the third-order spectrum of gravitational waves sourced by the amplified scalar field perturbations during inflation using the in-in formalism, and discuss the conditions for the third-order spectrum to be smaller than the second-order one. Assuming an exponential growth of the sub-horizon modes of the scalar field perturbations, we find that the third-order spectrum increases faster than the second-order one as the amplification of the field perturbations increases, and thus the third-order spectrum dominates for detectable gravitational waves, which indicates that the perturbation theory breakdowns. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_11337 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spectrum of third-order tensor perturbations induced by excited scalar fields Fang, Cheng-Jun Peng, Zhi-Zhang Hu, Han-Wen Guo, Zong-Kuan General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology We calculate for the first time the third-order spectrum of gravitational waves sourced by the amplified scalar field perturbations during inflation using the in-in formalism, and discuss the conditions for the third-order spectrum to be smaller than the second-order one. Assuming an exponential growth of the sub-horizon modes of the scalar field perturbations, we find that the third-order spectrum increases faster than the second-order one as the amplification of the field perturbations increases, and thus the third-order spectrum dominates for detectable gravitational waves, which indicates that the perturbation theory breakdowns. |
| title | Spectrum of third-order tensor perturbations induced by excited scalar fields |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.11337 |