New Constraints on Macroscopic Dark Matter Using Radar Meteor Detectors
Abstract
We show that dark-matter candidates with large masses and large nuclear interaction cross sections are detectable with terrestrial radar systems. We develop our results in close comparison to successful radar searches for tiny meteoroids, aggregates of ordinary matter. The path of a meteoroid (or suitable dark-matter particle) through the atmosphere produces ionization deposits that reflect incident radio waves. We calculate the equivalent radar echoing area or `radar cross section' for dark matter. By comparing the expected number of dark-matter-induced echoes with observations, we set new limits in the plane of dark-matter mass and cross section, complementary to pre-existing cosmological limits. Our results are valuable because (A) they open a new detection technique for which the reach can be greatly improved and (B) in case of a detection, the radar technique provides differential sensitivity to the mass and cross section, unlike cosmological probes.
Cite
@article{arxiv.2209.07690,
title = {New Constraints on Macroscopic Dark Matter Using Radar Meteor Detectors},
author = {Pawan Dhakal and Steven Prohira and Christopher V. Cappiello and John F. Beacom and Scott Palo and John Marino},
journal= {arXiv preprint arXiv:2209.07690},
year = {2023}
}
Comments
Main text 15 pages and 11 figures, Appendix 2 pages and 3 figures; Typos and references corrected