Unitarity and predictiveness in new Higgs inflation
Abstract
In new Higgs inflation the Higgs kinetic terms are nonminimally coupled to the Einstein tensor, allowing the Higgs field to play the role of the inflaton. The new interaction is nonrenormalizable, and the model only describes physics below some cutoff scale. Even if the unknown UV physics does not affect the tree level inflaton potential significantly, it may still enter at loop level and modify the running of the Standard Model (SM) parameters. This is analogous to what happens in the original model for Higgs inflation. A key difference, though, is that in new Higgs inflation the inflationary predictions are sensitive to this running. Thus the boundary conditions at the EW scale as well as the unknown UV completion may leave a signature on the inflationary parameters. However, this dependence can be evaded if the kinetic terms of the SM fermions and gauge fields are nonminimally coupled to gravity as well. Our approach to determine the model's UV dependence and the connection between low and high scale physics can be used in any particle physics model of inflation.
 Publication:

Journal of High Energy Physics
 Pub Date:
 March 2018
 DOI:
 10.1007/JHEP03(2018)038
 arXiv:
 arXiv:1711.08761
 Bibcode:
 2018JHEP...03..038F
 Keywords:

 Cosmology of Theories beyond the SM;
 Higgs Physics;
 Renormalization Group;
 Effective Field Theories;
 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Theory
 EPrint:
 21+6 pages, 1 figure