Production of Gravitational Waves from Preheating and Tachyonic Instabilities
Fuente:
arXiv
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912700807774208 |
|---|---|
| author | Alam, Khursid Dutta, Koushik Khan, Ahamadullah |
| author_facet | Alam, Khursid Dutta, Koushik Khan, Ahamadullah |
| contents | We analyze GW production during preheating for an $α$-attractor potential terminating in the positive-curvature regime, with energy transfer via $ϕχ^{2}$. Linear Floquet analysis and nonlinear simulations show that $ϕ$ fluctuations grow by parametric resonance, while $χ$ undergoes tachyonic bursts. The GW spectrum features two peaks: a dominant low-frequency peak from the parametric channel and a subdominant high-frequency peak from the tachyonic channel. Redshifted to today, the peak reaches $h^{2}Ω_{\rm GW}^{(0)} \sim 10^{-11}$ at $f^{(0)}_{p} \sim 10^{7}$ Hz. This multi-peak structure is a characteristic imprint of trilinear preheating in $α$-attractors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_27586 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Production of Gravitational Waves from Preheating and Tachyonic Instabilities Alam, Khursid Dutta, Koushik Khan, Ahamadullah Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory We analyze GW production during preheating for an $α$-attractor potential terminating in the positive-curvature regime, with energy transfer via $ϕχ^{2}$. Linear Floquet analysis and nonlinear simulations show that $ϕ$ fluctuations grow by parametric resonance, while $χ$ undergoes tachyonic bursts. The GW spectrum features two peaks: a dominant low-frequency peak from the parametric channel and a subdominant high-frequency peak from the tachyonic channel. Redshifted to today, the peak reaches $h^{2}Ω_{\rm GW}^{(0)} \sim 10^{-11}$ at $f^{(0)}_{p} \sim 10^{7}$ Hz. This multi-peak structure is a characteristic imprint of trilinear preheating in $α$-attractors. |
| title | Production of Gravitational Waves from Preheating and Tachyonic Instabilities |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2510.27586 |