Abstract
We find a new set of the Bianchi type I power-law expanding solutions in a string-motivated Dirac-Born-Infeld theory. Stability analysis shows that these power-law inflationary solutions remain stable with or without the contribution of the Dirac-Born-Infeld effect. We also find a new set of Bianchi type I expanding power-law solutions in a two scalar Dirac-Born-Infeld model with an additional phantom field. It is shown that the inclusion of the phantom field turns the Bianchi type I power-law solutions unstable during the inflationary phase.
Original language | English |
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Article number | 123009 |
Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
Volume | 84 |
Issue number | 12 |
DOIs | |
State | Published - 28 Dec 2011 |