Perturbations of Mimetic Curvaton
Fuente:
arXiv
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910443963940864 |
|---|---|
| author | Xiong, Anxianyi Zhang, Xin-zhe Qiu, Taotao |
| author_facet | Xiong, Anxianyi Zhang, Xin-zhe Qiu, Taotao |
| contents | The mimetic gravity theory is one of the interesting modified gravity theories, which aims to unify the matter component of our universe within the power of gravity. The mimetic-like theory can also be responsible for primordial perturbations production, e.g., when the mimetic field is set to be like a curvaton field, and the adiabatic perturbation can thus be generated from the isocurvature perturbation via usual curvaton mechanism [1]. In the original mimetic curvaton model, the parameter $λ$ was purely an algebraic multiplier, lack of any perturbed dynamics. In the current paper, we treat $λ$ as an auxiliary field, with its perturbation $δλ$ evolving alongside. We show that, with such a consideration, the adiabatic perturbation can still be generated from the curvaton mechanism, and becomes scale invariant with different field space configurations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_06921 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Perturbations of Mimetic Curvaton Xiong, Anxianyi Zhang, Xin-zhe Qiu, Taotao General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory The mimetic gravity theory is one of the interesting modified gravity theories, which aims to unify the matter component of our universe within the power of gravity. The mimetic-like theory can also be responsible for primordial perturbations production, e.g., when the mimetic field is set to be like a curvaton field, and the adiabatic perturbation can thus be generated from the isocurvature perturbation via usual curvaton mechanism [1]. In the original mimetic curvaton model, the parameter $λ$ was purely an algebraic multiplier, lack of any perturbed dynamics. In the current paper, we treat $λ$ as an auxiliary field, with its perturbation $δλ$ evolving alongside. We show that, with such a consideration, the adiabatic perturbation can still be generated from the curvaton mechanism, and becomes scale invariant with different field space configurations. |
| title | Perturbations of Mimetic Curvaton |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2405.06921 |