Nojiri Shin?ichi; Odincov Sergey Dmitrievich; Oikonomou Vasilis; Popov Arkadiy Aleksandrovich
(2020)
In this paper we shall study the evolution of cosmological gravitational waves in the context of Chern-Simons axion F(R) gravity. In the case of Chern-Simons axion F(R) gravity there exist spin-0, spin-2 and spin-1 modes. ...