The Multi-Messenger Astroparticle Physics: the First Constraint on Light Millicharged Dark Matter via Time-Delay Analysis of GRB GW170817A

TL;DR

This paper uses the observed time delay between gravitational waves and gamma-ray bursts from GW170817 to set new constraints on light millicharged dark matter, improving existing limits for masses below 10^{-15} eV.

Contribution

It introduces a novel method of constraining millicharged dark matter using multi-messenger time-delay analysis from neutron star merger observations.

Findings

Constrained millicharged dark matter parameter $\\epsilon$ to be less than $10^{-14}$ for masses below $10^{-15}$ eV.

Achieved the most stringent limits to date on light millicharged dark matter.

Demonstrated the effectiveness of multi-messenger astrophysics in probing beyond Standard Model physics.

Abstract

The multi-messenger astroparticle physics provides a new approach to probe the new physics beyond the Standard Model. We propose to probe the light dark matter which can interact with electromagnetic interaction. To be concrete, we derive the new constraint on the millicharged dark matter from the multi-messenger observations of GW170817. In the neutron star merger event GW170817, the first detection of a gamma-ray burst (GRB) delayed by approximately 1.7 seconds relative to the gravitational wave emission was observed. Utilizing this delay, we constrain the parameter space of the millicharged dark matter within the large-scale structure of the Universe. For dark matter mass below $10^{-15}$ eV, the parameter $\epsilon$ is constrained to be less than $10^{-14}$, representing the most stringent limits achieved to date.