Spin-2 Portal Dark Matter
Nicolas Bernal, Maira Dutra, Yann Mambrini, Keith A. Olive, Marco, Peloso, Mathias Pierre

TL;DR
This paper explores how a massive spin-2 particle can serve as an effective mediator between dark matter and the Standard Model, enabling dark matter production via freeze-in during reheating, often surpassing gravitational interactions.
Contribution
It introduces a generalized model with a spin-2 mediator as a portal, analyzing its effectiveness across various mass and temperature parameters during reheating.
Findings
Spin-2 mediators can dominate dark matter production over gravitational interactions.
The model's effectiveness varies with the spin-2 mass relative to reheating temperatures.
Systematic analysis covers different parameter regimes for the spin-2 mass.
Abstract
We generalize models invoking a spin-2 particle as a mediator between the dark sector and the Standard Model. We show that a massive spin-2 messenger can efficiently play the role of a portal between the two sectors. The dark matter is then produced via a freeze-in mechanism during the reheating epoch. In a large part of the parameter space, production through the exchange of a massive spin-2 mediator dominates over processes involving a graviton with Planck suppressed couplings. We perform a systematic analysis of such models for different values of the spin-2 mass relative to the maximum and the final temperature attained at reheating.
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