Primordial Gravitational Waves from Scalar Backreaction in Axion-SU(2) Inflation
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| author | Cielo, Mattia Dimastrogiovanni, Ema Fasiello, Matteo Papageorgiou, Alexandros |
| author_facet | Cielo, Mattia Dimastrogiovanni, Ema Fasiello, Matteo Papageorgiou, Alexandros |
| contents | In this work, we perform the first numerical study of strong scalar backreaction in spectator chromo-natural inflation (SCNI) in the case where the spectator sector decays during inflation. The tachyonic instability in scalar fluctuations, activated as the system crosses the $m_Q = \sqrt{2}$ threshold, amplifies perturbations and may significantly alter the background dynamics. The strong scalar backreaction regime introduces an effective quartic term in the potential for the gauge field background that rapidly drives it to zero, accelerating the axion-gauge system decay. We describe the dynamics of such decay and derive the gravitational wave spectrum for a set of benchmark parameters. Interestingly, the signal may peak at interferometer scales and lie within LISA's projected sensitivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_08622 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Primordial Gravitational Waves from Scalar Backreaction in Axion-SU(2) Inflation Cielo, Mattia Dimastrogiovanni, Ema Fasiello, Matteo Papageorgiou, Alexandros Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology In this work, we perform the first numerical study of strong scalar backreaction in spectator chromo-natural inflation (SCNI) in the case where the spectator sector decays during inflation. The tachyonic instability in scalar fluctuations, activated as the system crosses the $m_Q = \sqrt{2}$ threshold, amplifies perturbations and may significantly alter the background dynamics. The strong scalar backreaction regime introduces an effective quartic term in the potential for the gauge field background that rapidly drives it to zero, accelerating the axion-gauge system decay. We describe the dynamics of such decay and derive the gravitational wave spectrum for a set of benchmark parameters. Interestingly, the signal may peak at interferometer scales and lie within LISA's projected sensitivity. |
| title | Primordial Gravitational Waves from Scalar Backreaction in Axion-SU(2) Inflation |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.08622 |