Gravitational-wave mediated preheating
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We propose a new preheating mechanism through the coupling of the gravitational field to both the inflaton and matter fields, without direct inflaton-matter couplings. The inflaton transfers power to the matter fields through interactions with gravitational waves, which are exponentially enhanced due to an inflation-graviton coupling. One such coupling is the product of the inflaton to the Pontryagin density, as in dynamical Chern-Simons gravity. The energy scales involved are constrained by requiring that preheating happens fast during matter domination
Alexander, Stephon, Sam Cormack, Antonino MarcianÃƒÂ², and Nicolas Yunes. "Gravitational-wave mediated preheating." Physics Letters B 743 (April 2015): 82-86. DOI:https://dx.doi.org/10.1016/j.physletb.2015.02.018.