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Abstract: The extreme environments near black holes (BHs) provide unparalleled opportunities to explore fundamental physics. These regions can host extraordinarily high densities, transforming BHs into efficient transducers of new particles. Notable examples include the superradiant amplification of ultralight bosons, which can achieve near-Planck-scale field values, and the adiabatic accretion of dark matter spikes. Such high densities amplify observational signals, ranging from gravitational wave signatures of the environment to electromagnetic imaging of BHs. Within these dense boson configurations, phenomena reminiscent of early-universe cosmology—such as non-perturbative particle production—naturally emerge. The resulting particle fluxes open new avenues for dark matter detection, neutrino observation, and the use of diverse quantum sensors, focusing observational efforts on target BHs or galactic centers.
Bio: Yifan Chen, currently a postdoctoral researcher at the Niels Bohr Institute, University of Copenhagen (Denmark), has previously studied and worked at the University of Science and Technology of China, École Polytechnique (France), Sorbonne University (France), and the Institute of Theoretical Physics, Chinese Academy of Sciences. His research is in the intersection of particle physics, black hole and gravitational waves, and various detection methods.
Biography:
Postdoc, 2022 — now, postdoc, Niels Bohr Institute, Denmark
Postdoc, 2019 — 2022, postdoc, ITP-CAS, China
Ph.D. 2019, LPTHE, Sorbonne Universite, France
M.S. 2016, Ecole Polytechnique, France
B.S. 2014, University of Science and Technology of China, China
Video link: https://vshare.sjtu.edu.cn/play/8f834c51-1fe6-4a07-ac58-052b13948caa