Gravitational waves propagating through an oscillatory scalar condensate of metric origin acquire a modified, Whittaker-function profile and a non-standard dispersion relation, carrying an imprint of the alpha R squared curvature term.
The evolution of gravitons in accelerating cosmologies: the case of extended gravity
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abstract
We discuss the production and evolution of cosmological gravitons showing how the cosmological background affects their dynamics. Besides, the detection of cosmological gravitons could constitute an extremely important signature to discriminate among different cosmological models. Here we consider the cases of scalar-tensor gravity and $f(R)$ gravity where it is demonstrated the amplification of graviton amplitude changes if compared with General Relativity. Possible observational constraints are discussed.
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Gravitational Wave Propagation in a Geometric Condensate in Starobinsky Cosmology
Gravitational waves propagating through an oscillatory scalar condensate of metric origin acquire a modified, Whittaker-function profile and a non-standard dispersion relation, carrying an imprint of the alpha R squared curvature term.