TY - JOUR
T1 - Anisotropic inflation with derivative couplings
AU - Holland, Jonathan
AU - Kanno, Sugumi
AU - Zavala, Ivonne
N1 - Funding Information:
We thank Gianmassimo Tasinato for discussions. S. K. was supported by IKERBASQUE, the Basque Foundation for Science, and the Basque Government (IT-979-16), and Spanish Ministry MINECO (FPA2015-64041-C2-1P). I. Z. was partially supported by the STFC Grants No. ST/N001419/1 and No. ST/L000369/1. S. K. would like to thank the Physics Department at Swansea University for warm hospitality and the College Research Fund for financial support. J. H. was supported by a Swansea College of Science Doctoral Training Centre (DTC) Research Scholarship funded partly by Swansea University and partly by the STFC.
PY - 2018/5/15
Y1 - 2018/5/15
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevD.97.103534
DO - 10.1103/PhysRevD.97.103534
M3 - Article
AN - SCOPUS:85048132126
VL - 97
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 10
M1 - 103534
ER -