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Graviton creation by small scale factor oscillations in an expanding universe
2016
Physical Review D
We treat quantum creation of gravitons by small scale factor oscillations around the average of an expanding universe. Such oscillations can arise in standard general relativity due to oscillations of a homogeneous, minimally coupled scalar field. They can also arise in modified gravity theories with a term proportional to the square of the Ricci scalar in the gravitational action. The graviton wave equation is different in the two cases, leading to somewhat different creation rates. Both cases
doi:10.1103/physrevd.94.084030
fatcat:gjsoamrtkndk3pmxk7si73pi44