Higgs inflation in EinsteinCartan gravity
Abstract
We study inflation driven by the Higgs field in the EinsteinCartan formulation of gravity. In this theory, the presence of the Holst and NiehYan terms with the Higgs field nonminimally coupled to them leads to three additional coupling constants. For a broad range of parameters, we find that inflation is both possible and consistent with observations. In most cases, the spectral index is given by n_{s}=1−2/N_{star} (with N_{star} the number of efoldings) whereas the tensortoscalar ratio r can vary between about 10^{−10} and 1. Thus, there are scenarios of Higgs inflation in the EinsteinCartan framework for which the detection of gravitational waves from inflation is possible in the near future. In certain limits, the known models of Higgs inflation in the metric and Palatini formulations of gravity are reproduced. Finally, we discuss the robustness of inflationary dynamics against quantum corrections due to the scalar and fermion fields.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 February 2021
 DOI:
 10.1088/14757516/2021/02/008
 arXiv:
 arXiv:2007.14978
 Bibcode:
 2021JCAP...02..008S
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 26 pages, 8 figures, 1 appendix