Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.18340 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866908670815633408 |
|---|---|
| author | Deng, Weiyi Han, Chengcheng Lei, Zhanhong Yang, Jin Min |
| author_facet | Deng, Weiyi Han, Chengcheng Lei, Zhanhong Yang, Jin Min |
| contents | In this work we investigate curvature perturbations and non-Gaussianity arising from Higgs modulated reheating in the early Universe. We employ three different methods -- the period-averaging (PA) method, the exact method, and the non-perturbative $δN$ formalism -- to compute the power spectrum and bispectrum of curvature perturbations. Our results show that the non-perturbative $δN$ method provides a reliable estimate across a wide range of reheating time and Higgs field values, including regimes where the Higgs field oscillates significantly after inflation. We find that a smaller Higgs self-coupling ($λ$) leads to a larger curvature perturbation, with the non-Gaussianity predominantly taking a local shape. This highlights the importance of considering non-perturbative effects in calculating the curvature perturbation during Higgs modulated reheating, especially for smaller values of $λ$. Our findings offer valuable insights into the dynamics of reheating and the generation of primordial perturbations in the early Universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_18340 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Curvature Perturbations from Higgs Modulated Reheating Deng, Weiyi Han, Chengcheng Lei, Zhanhong Yang, Jin Min Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology In this work we investigate curvature perturbations and non-Gaussianity arising from Higgs modulated reheating in the early Universe. We employ three different methods -- the period-averaging (PA) method, the exact method, and the non-perturbative $δN$ formalism -- to compute the power spectrum and bispectrum of curvature perturbations. Our results show that the non-perturbative $δN$ method provides a reliable estimate across a wide range of reheating time and Higgs field values, including regimes where the Higgs field oscillates significantly after inflation. We find that a smaller Higgs self-coupling ($λ$) leads to a larger curvature perturbation, with the non-Gaussianity predominantly taking a local shape. This highlights the importance of considering non-perturbative effects in calculating the curvature perturbation during Higgs modulated reheating, especially for smaller values of $λ$. Our findings offer valuable insights into the dynamics of reheating and the generation of primordial perturbations in the early Universe. |
| title | Curvature Perturbations from Higgs Modulated Reheating |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2511.18340 |