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Ricci reheating
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DOI：10.1088/1475-7516/2019/07/016.png)
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摘要
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We present a model for viable gravitational reheating involving a scalar field directly coupled to the Ricci curvature scalar. Crucial to the model is a period of kination after inflation, which causes the Ricci scalar to change sign thus inducing a tachyonic effective mass m(2) proportional to -H-2 for the scalar field. The resulting tachyonic growth of the scalar field provides the energy for reheating, allowing for temperatures high enough for thermal leptogenesis. Additionally, the required period of kination necessarily leads to a blue-tilted primordial gravitational wave spectrum with the potential to be detected by future experiments. We find that for reheating temperatures T-RH less than or similar to 1 GeV, the possibility exists for the Higgs field to play the role of the scalar field.
Keyword:
physics of the early universe
cosmology of theories beyond the SM
particle physics - cosmology connection
primordial gravitational waves (theory)
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