Oscillating Spin-2 Dark Matter

TL;DR

This paper proposes a model where oscillating spin-2 fields from bimetric theory can account for dark matter, offering testable predictions in precision experiments and potential extensions with multimetric frameworks.

Contribution

It introduces a novel spin-2 dark matter model based on bimetric theory, detailing its cosmological behavior and experimental testability.

Findings

The spin-2 field can produce the observed dark matter abundance.

The model predicts detectable signals in atomic clocks and resonant mass detectors.

Extensions to multimetric theories can incorporate the clockwork mechanism for gravity.

Abstract

We show that the coherent oscillations of a spin-2 field from bimetric theory can easily account for the observed dark matter abundance. We obtain the equation of motion for the field in a cosmological setting and discuss in detail the phenomenology of the model. The framework is testable in precision measurements of oscillating electric charge in atomic clocks, using atomic spectroscopy and in dedicated resonant mass detectors as well as in axion-like-particles experiments, which therefore provide a new window to probe and test gravity itself. We also comment on possible multimetric extensions of the framework that straightforwardly implement the clockwork mechanism for gravity.