报告时间：2023年4月12日下午3点

报告地点：知新楼C913

报告摘要：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.

报告人简介：刘佳，北京大学物理学院研究员，博雅青年学者。本科毕业于清华大学，硕士毕业于北京大学，博士毕业于纽约大学，之后在德国美因茨大学和芝加哥大学做博士后研究。从事粒子物理理论研究，研究方向为高能物理唯象学和粒子天体物理等。