ABSTRACT
We propose using radio telescopes to explore the conversion of dark photons, a potential ultralight dark matter candidate, through both solar observations and the telescopes themselves. The local absorption of dark photon dark matter can induce harmonic oscillations of electrons inside radio telescopes, resulting in a monochromatic radio signal that receivers can detect. The FAST telescope has already achieved an upper limit on kinetic mixing of $10^{-12}$ for DPDM oscillation frequencies at $1-1.5$ GHz, which is stronger than the cosmic microwave background constraint. LOFAR and SKA1 telescopes can achieve extraordinary sensitivities for direct DPDM search from 10 MHz to 10 GHz. Additionally, due to the strong resonant conversion, the solar corona provides an ideal location for observing dark photon conversion. Using observational data, the LOFAR telescope can reach a kinetic mixing of $\epsilon \sim 10^{-13}$ in the frequency range of $30-80$ MHz, which exceeds the cosmic microwave background constraint.
BIOGRAPHY
Prof. Jia Liu, currently an assistant professor at Peking University’s School of Physics (since 2020), is supported by China’s National High-Level Youth Talent Program. He earned his B.S. from Tsinghua University, followed by an M.S. from Peking University, and a Ph.D. from New York University. His academic training includes postdoctoral research at Johannes Gutenberg University Mainz and the University of Chicago. Specializing in theoretical particle physics, his work focuses on high-energy physics phenomenology and particle astrophysics.
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