Nonminimal scalartensor theories
Abstract
We compute the spectrum, mixing and interaction structure of scalar models with a general coupling to the scalar curvature. As it is well known the perturbative states of these theories are given by two massive spin0 modes in addition to one massless spin2 state. This latter mode can be identified with the standard graviton field. Indeed, it is possible to define an Einstein frame, where the dynamics of the massless spin2 graviton is the one associated with the EinsteinHilbert action. We explore systematically the interactions of all these degrees of freedom in the mentioned frame, since part of the coupling structure can be anticipated by geometrical arguments.
 Publication:

Physical Review D
 Pub Date:
 February 2020
 DOI:
 10.1103/PhysRevD.101.044007
 arXiv:
 arXiv:1411.1653
 Bibcode:
 2020PhRvD.101d4007A
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 12 pages, no figures