期刊
PHYSICAL REVIEW D
卷 97, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.97.103534
关键词
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资金
- Spanish Ministry MINECO [FPA2015-64041-C2-1P]
- STFC [ST/N001419/1, ST/L000369/1]
- College Research Fund
- Swansea College of Science Doctoral Training Centre (DTC) Research Scholarship - Swansea University
- STFC
- IKERBASQUE
- Basque Foundation for Science
- Basque Government [IT-979-16]
- STFC [ST/P00055X/1, 1815321] Funding Source: UKRI
We study anisotropic power-law inflationary solutions when the inflaton and its derivative couple to a vector field. This type of coupling is motivated by D-brane inflationary models, in which the inflaton, and a vector field living on the D-brane, couple disformally (derivatively). We start by studying a phenomenological model where we show the existence of anisotropic solutions and demonstrate their stability via a dynamical system analysis. Compared to the case without a derivative coupling, the anisotropy is reduced and thus can be made consistent with current limits, while the value of the slow-roll parameter remains almost unchanged. We also discuss solutions for more general cases, including D-brane-like couplings.
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