Successful Higgs inflation from combined nonminimal and derivative couplings
arXiv:2102.08450 · doi:10.1103/PhysRevD.104.023530
Abstract
We propose an inflationary scenario based on the concurrent presence of non-minimal coupling (NMC) and generalized non-minimal derivative coupling (GNMDC), in the context of Higgs inflation. The combined construction maintains the advantages of the individual scenarios without sharing their disadvantages. In particular, a long inflationary phase can be easily achieved due to the gravitational friction effect owed to the GNMDC, without leading to trans-Planckian values and unitarity violation. Additionally, the tensor-to-scalar ratio remains to low values due to the NMC contribution. Finally, the instabilities related to the squared sound-speed of scalar perturbations, which plague the simple GNMDC scenarios, are now healed due to the domination of the NMC contribution and the damping of the GNMDC effects during the reheating era. These features make scenarios with nonminimal and derivative couplings to gravity successful candidates for the description of inflation.
arXiv commentVersion 3 published in PRD, 16 pages, 5 figures. Replacecd initial α=7 combined model with α=5, for demonstrative purposes. Added a combined model with a polynomial GNMDC and a corresponding discussion, as well as suggestive comments throughout. References added
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