Propagation of gravitational waves in Chern-Simons axion Einstein gravity of gravitational waves in
a flat Friedman-Robertson-Walker background, in the context of
a string motivated
F (R) gravity inflation with string-corrected axion dark matter and the background evolution for
a flat Friedman-Robertson-Walker universe. In this paper, we study and quantify
Propagation of gravitational waves in Chern-Simons axion Einstein gravityIn this paper we shall investigate the propagation of gravitational waves in
a flat Friedman