Detection Prospects of Dark Matter in Einstein Telescope

TL;DR

This paper assesses the Einstein Telescope's potential to detect dark matter through elastic motion signals, highlighting the importance of mirror thickness and resonance effects for high-frequency detection of PeV-scale dark matter.

Contribution

It provides improved calculations for dark matter detection signals in gravitational wave detectors, considering mirror thickness and resonance phenomena for the first time.

Findings

Multiple resonances predicted in high-frequency regime

Detection possible for dark matter heavier than a few PeV

Signal-to-noise ratio can exceed one for boosted dark matter

Abstract

We improve the calculations of the elastic motion induced by the dark matter hits on the surface of the mirror equipped with the interferometer for gravitational waves detection. We focus on the discovery potential of such a dark matter signal on the third-generation European gravitational waves detector, the Einstein Telescope. By taking the thickness of mirror into account, more than one resonances are predicted in the sensitive regime of high frequency interferometer. When mass of dark matter is heavier than a few PeV or is highly boosted, the signal-to-noise ratio could exceed one, and Einstein Telescope should be about to detect this dark matter signal.