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Ultralight bosons, such as axions and dark photons, have emerged as compelling candidates for new physics, motivating a range of searches across particle physics. However, detecting these bosons remains a significant challenge due to their extremely weak interactions with Standard Model particles. This talk explores two approaches to enhancing these searches: (1) the amplification of boson density near black holes (BHs), where strong gravitational fields can significantly boost their concentration; and (2) the use of quantum sensors on Earth to capture the coherent oscillations of local ultralight dark matter. Key phenomena like superradiant amplification, which can lead to near-Planck-scale field values, can significantly increase the density of ultralight bosons in the vicinity of BHs. These high densities enhance the detectability of signals, including gravitational wave emissions and electromagnetic signatures from BHs. In these dense boson environments, early-universe-like phenomena, such as non-perturbative particle production, can emerge. These processes offer novel opportunities for dark matter detection, neutrino observation, and the development of new quantum sensor technologies, enabling focused observational efforts on specific BHs or galactic centers.
Yifan Chen is currently a postdoctoral researcher at the Niels Bohr Institute, University of Copenhagen (Denmark). He 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 focuses on fundamental particle physics, employing a variety of approaches that include astrophysical observations and terrestrial detection techniques.
Tencent meeting link: https://meeting.tencent.com/dm/nD2DhrIWGLD4 (Meeting ID: 962142015 No password)