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Reheating of the universe after inflation with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>f</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>ϕ</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mi>R</mml:mi></mml:math>gravity
We show that reheating of the universe occurs spontaneously in a broad class of inflation models with $f(\ensuremath{\phi})R$ gravity ($\ensuremath{\phi}$ is the inflaton). The model does not require explicit couplings between $\ensuremath{\phi}$ and bosonic or fermionic matter fields. The couplings arise spontaneously when $\ensuremath{\phi}$ settles in the vacuum expectation value …