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2023

Graceful exit from inflation and reheating with twin waterfalls

Lee, Hyun Min, Menkara, Adriana

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We study the hybrid inflation with a pseudo-Nambu-Goldstone boson inflaton and two waterfall scalar fields.

The $Z_2$ symmetry for the waterfall fields keeps inflaton potential flat against quantum corrections coming from the waterfall couplings, and it is broken spontaneously in the vacuum without a domain wall problem within the Hubble horizon of our universe.
We show that the $Z_2$ invariant Higgs portal couplings to the waterfall fields are responsible for the reheating process, leading to a sufficiently large reheating temperature after inflation.
In the presence of an extra $Z'_2$ symmetry, one of the waterfall fields or another singlet scalar field becomes a dark matter candidate.

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