Particle conversions beyond the WKB approximation and solar-induced gravitational waves from dark photon dark matter

作者：Tengyu Ai, Yuxuan He, Jia Liu, Xiaolin Ma, Xiao-Ping Wang · 发表于：Physical review. D/Physical review. D. · 年份：2024 · DOI：10.1103/physrevd.110.115026 · 被引用次数：2 · 研究领域：Cosmology and Gravitation Theories、Pulsars and Gravitational Waves Research、Dark Matter and Cosmic Phenomena

We investigate the conversion of kinetic mixing dark photon dark matter into gravitational waves within the magnetic field of the Sun. Our study reveals that the WKB approximation is invalid in this scenario. We derive an analytic solution for the conversion probability with unitary evolution feature. This solution aligns in form with previous studies on photon-gravitational wave conversion. Interestingly, it is applicable in situations where the WKB approximation fails. We extend the unitary evolution solution to other conversion processes, such as axion-photon and dark photon-photon conversions. When the WKB approximation conditions are met, this solution reduces to the WKB result. We compute the characteristic strain of gravitational waves resulting from dark photon conversion in the solar magnetic field, spanning frequencies from 10 − 5 Hz to 10 6 Hz . Our findings indicate that the characteristic strain derived from the unitary evolution solution differs significantly from that of the WKB solution. The resulting strain signal is far below the sensitivity of current gravitational wave interferometers. Nevertheless, we have proposed an exotic gravitational wave source, which could be useful in nonminimal dark sector models. Published by the American Physical Society 2024