Anisotropic power-law inflation for a model of two scalar and two vector fields
Abstract Inspired by an interesting counterexample to the cosmic no-hair conjecture found in a supergravity-motivated model recently, we propose a multi-field extension, in which two scalar fields are allowed to non-minimally couple to two vector fields, respectively. This model is shown to admit an...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-06-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-021-09334-y |
| _version_ | 1819001344585891840 |
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| author | Tuan Q. Do W. F. Kao |
| author_facet | Tuan Q. Do W. F. Kao |
| author_sort | Tuan Q. Do |
| collection | DOAJ |
| description | Abstract Inspired by an interesting counterexample to the cosmic no-hair conjecture found in a supergravity-motivated model recently, we propose a multi-field extension, in which two scalar fields are allowed to non-minimally couple to two vector fields, respectively. This model is shown to admit an exact Bianchi type I power-law solution. Furthermore, stability analysis based on the dynamical system method is performed to show that this anisotropic solution is indeed stable and attractive if both scalar fields are canonical. Nevertheless, if one of the two scalar fields is phantom then the corresponding anisotropic power-law inflation turns unstable as expected. |
| first_indexed | 2024-12-20T22:47:43Z |
| format | Article |
| id | doaj.art-ba3bbdc5c0314d0994ee3548b7b7bf0b |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-20T22:47:43Z |
| publishDate | 2021-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-ba3bbdc5c0314d0994ee3548b7b7bf0b2022-12-21T19:24:19ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522021-06-0181611110.1140/epjc/s10052-021-09334-yAnisotropic power-law inflation for a model of two scalar and two vector fieldsTuan Q. Do0W. F. Kao1Phenikaa Institute for Advanced Study, Phenikaa UniversityInstitute of Physics, National Chiao Tung UniversityAbstract Inspired by an interesting counterexample to the cosmic no-hair conjecture found in a supergravity-motivated model recently, we propose a multi-field extension, in which two scalar fields are allowed to non-minimally couple to two vector fields, respectively. This model is shown to admit an exact Bianchi type I power-law solution. Furthermore, stability analysis based on the dynamical system method is performed to show that this anisotropic solution is indeed stable and attractive if both scalar fields are canonical. Nevertheless, if one of the two scalar fields is phantom then the corresponding anisotropic power-law inflation turns unstable as expected.https://doi.org/10.1140/epjc/s10052-021-09334-y |
| spellingShingle | Tuan Q. Do W. F. Kao Anisotropic power-law inflation for a model of two scalar and two vector fields European Physical Journal C: Particles and Fields |
| title | Anisotropic power-law inflation for a model of two scalar and two vector fields |
| title_full | Anisotropic power-law inflation for a model of two scalar and two vector fields |
| title_fullStr | Anisotropic power-law inflation for a model of two scalar and two vector fields |
| title_full_unstemmed | Anisotropic power-law inflation for a model of two scalar and two vector fields |
| title_short | Anisotropic power-law inflation for a model of two scalar and two vector fields |
| title_sort | anisotropic power law inflation for a model of two scalar and two vector fields |
| url | https://doi.org/10.1140/epjc/s10052-021-09334-y |
| work_keys_str_mv | AT tuanqdo anisotropicpowerlawinflationforamodeloftwoscalarandtwovectorfields AT wfkao anisotropicpowerlawinflationforamodeloftwoscalarandtwovectorfields |