Successful (Higgs) inflation from combined non minimal and derivative couplings.

Abstract: We discuss an inflationary scenario based on the concurrent presence of non-minimal coupling (NMC) and generalized non-minimal derivative coupling (GNMDC). The combined construction maintains the advantages of the individual scenarios without sharing their disadvantages. A long inflationary phase can be 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 low due to the NMC contribution. Finally, the instabilities related to the squared sound-speed of scalar perturbations, which plague the Derivative Coupling scenarios, are now healed due to the domination of the NMC contribution and the damping of the GNMDC effects during the reheating era.

general relativity and quantum cosmologyHEP - latticeHEP - phenomenologyHEP - theorymathematical physics

Audience: researchers in the topic

High Energy Theory, Gravity and Cosmology Seminars @ NTUA