Regular Article - Theoretical Physics
Anisotropic constant-roll inflation for the Dirac–Born–Infeld model
Phenikaa Institute for Advanced Study, Phenikaa University, 12116, Hanoi, Vietnam
2 Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 11307, Hanoi, Vietnam
3 Faculty of Basic Sciences, Phenikaa University, 12116, Hanoi, Vietnam
Accepted: 11 September 2021
Published online: 21 September 2021
In this paper, we study a non-canonical extension of a supergravity-motivated model acting as a vivid counterexample to the cosmic no-hair conjecture due to its unusual coupling between scalar and electromagnetic fields. In particular, a canonical scalar field is replaced by the string-inspired Dirac–Born–Infeld one in this extension. As a result, exact anisotropic inflationary solutions for this Dirac–Born–Infeld model are figured out under a constant-roll condition. Furthermore, numerical calculations are performed to verify that these anisotropic constant-roll solutions are indeed attractive during their inflationary phase.
© The Author(s) 2021
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