Constraints on Strongly-Interacting Dark Matter from the James Webb Space Telescope

TL;DR

This paper uses JWST NIRSpec calibration images to set new constraints on sub-GeV dark matter particles that interact with electrons, especially those with large cross sections that evade traditional detection methods.

Contribution

It introduces a novel use of JWST calibration data to constrain strongly-interacting dark matter, extending the search to parameter regions previously unconstrained.

Findings

Disfavors all previously allowed high cross-section parameter space for a 0.4% dark matter subcomponent.

Provides constraints on subcomponent fractions as low as approximately 1%.

Demonstrates the effectiveness of JWST calibration images in dark matter searches.

Abstract

Direct-detection searches for dark matter are insensitive to dark matter particles that have large interactions with ordinary matter, which are stopped in the atmosphere or the Earth's crust before reaching terrestrial detectors. We use ``dark'' calibration images taken with the HgCdTe detectors in the Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope (JWST) to derive novel constraints on sub-GeV dark matter candidates that scatter off electrons. We supplement the JWST analysis pipeline with additional masks to remove pixels with high-energy background events. For a 0.4% subcomponent of dark matter that interacts with an ultralight dark photon, we disfavor all previously allowed parameter space at high cross sections, and constrain some parameter regions for subcomponent fractions as low as $\sim$0.01%.