Title:
First results from ultralight vector dark matter search with KAGRA

Speaker:
Yuta Michimura on behalf of the LIGO-Virgo-KAGRA Collaboration

Abstract:
Despite overwhelming observational evidence for the existence of dark matter, its identity and properties remain a mystery. Bosonic ultralight fields with masses below 1 eV are gaining a lot of attention, as they are well motivated by cosmology. Laser interferometeric gravitational wave detectors are sensitive to oscillations from such fields that change the interference fringe. Massive vector field weakly coupled to the standard model sector can be searched for by measuring the oscillating forces acting on the suspended mirrors of the interferometers. KAGRA is a unique detector that employs both sapphire and fused silica mirrors, and is suitable for searching for such fields, by measuring the distance between mirrors with different materials [PRD 102, 102001 (2020)]. In this talk, I will report on the first results from the analysis using the data from the KAGRA’s observing run in 2020 [arXiv:2403.03004].