Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 81, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-021-09334-y
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Funding
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.01-2020.15]
- Ministry of Science and Technology (MOST) of Taiwan
- MOST [109-2112-M-009-001]
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A multi-field extension model was proposed, with an exact Bianchi type I power-law solution shown to be stable and attractive if both scalar fields are canonical, but becomes unstable when one of the scalar fields is phantom.
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.
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