Black holes and cosmic expansion are not the only settings for relativity to play a role in astronomy. Galaxies are always dressed with a dark halo of uncertain nature, possibly involving modification of General Relativity and the so-called cosmological "constant". I discuss some evidence for relativistic physics in galaxies and galaxy clusters and future measurements in light of the Chinese Space Station Space Telescope (CSST), FAST, DAMPE, Taiji, and Tianqin and other facilities, and how to test if black holes and galaxies are dressed with extra dark fields in non-standard theories. 

Biography

Prof. Hongsheng Zhao is a specialist in dark matter and modified gravity physics. He started his career from the CUSPEA program and did a PhD with David Spergel and Mike Rich at Columbia University on the Milky Way bar orbit and microlensing model, and then did his postdoc on galaxy modeling with Simon White in Max Planck Institute for Astrophysics and Tim de Zeeuw in Leiden Observatory, then he was awarded the Advanced Fellow in Cambridge University 2002, and became a tenured professor at University of St Andrews, and has been awarded the Gutenberg Chair Professor in France and several visiting professors in UK and Chinese universities. His publications have a Google h-index=56, ranging from standard dark matter annihilation and dynamics to modified gravity and dark energy.

Inviter: Yue-Liang Wu