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Gravitational dark matter production in Palatini preheating

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arxiv 2007.03484 v2 pith:J3WYWD4Y submitted 2020-07-07 astro-ph.CO gr-qchep-phhep-th

Alexandros Karam , Martti Raidal , Eemeli Tomberg This is my paper · ORCID
classification astro-ph.COgr-qchep-phhep-th
keywords fielddarkgravitationalinflationinflatonmattermechanismpalatini
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abstract

We study preheating in plateau inflation in the Palatini formulation of general relativity, in a special case that resembles Higgs inflation. It was previously shown that the oscillating inflaton field returns to the plateau repeatedly in this model, and this leads to tachyonic production of inflaton particles. We show that a minimally coupled spectator scalar field can be produced even more efficiently by a similar mechanism. The mechanism is purely gravitational, and the scalar field mass can be of order $10^{13}$ GeV, larger than the Hubble scale by many orders of magnitude, making this a candidate for superheavy dark matter.

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  1. A note on the gravitational dark matter production

    gr-qc 2024-12 conditional novelty 4.0 of 10

    The study connects the reheating temperature to the dark matter mass in two gravitational production scenarios and derives narrow viable mass ranges for each.

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