Sound Speed Resonance of Gravitational Waves in Gauss-Bonnet-coupled inflation
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| Format: | Preprint |
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2024
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| _version_ | 1866909435574616064 |
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| author | Addazi, Andrea Aldabergenov, Yermek Cai, Yifu |
| author_facet | Addazi, Andrea Aldabergenov, Yermek Cai, Yifu |
| contents | We demonstrate the occurrence of Sound Speed Resonances (SSR) in Gauss-Bonnet-coupled inflation across a wide range of coupling functions and parameters. After inflation, the damped oscillations of the inflaton around its potential minimum induces damped oscillations of the sound speed of tensor modes, leading to resonant amplification of the latter. Once the inflaton stabilizes around the minimum, the tensor sound speed reduces to unity (speed of light). In the context of multi-field inflation, the sound speed oscillations can be followed by a second phase of inflation, resulting in a distinctive stochastic background of Gravitational Waves (GWs). We show that these GW signals can be probed by upcoming experiments such as $\textbf{SKA}$, $\textbf{DECIGO}$, and $\textbf{BBO}$ depending on the duration of the second inflationary phase. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_05091 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Sound Speed Resonance of Gravitational Waves in Gauss-Bonnet-coupled inflation Addazi, Andrea Aldabergenov, Yermek Cai, Yifu General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory We demonstrate the occurrence of Sound Speed Resonances (SSR) in Gauss-Bonnet-coupled inflation across a wide range of coupling functions and parameters. After inflation, the damped oscillations of the inflaton around its potential minimum induces damped oscillations of the sound speed of tensor modes, leading to resonant amplification of the latter. Once the inflaton stabilizes around the minimum, the tensor sound speed reduces to unity (speed of light). In the context of multi-field inflation, the sound speed oscillations can be followed by a second phase of inflation, resulting in a distinctive stochastic background of Gravitational Waves (GWs). We show that these GW signals can be probed by upcoming experiments such as $\textbf{SKA}$, $\textbf{DECIGO}$, and $\textbf{BBO}$ depending on the duration of the second inflationary phase. |
| title | Sound Speed Resonance of Gravitational Waves in Gauss-Bonnet-coupled inflation |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2408.05091 |