Speaker
Dr
思媛 侯
(紫金山天文台)
Description
Cold dark matter (CDM) has been remarkably successful in describing the large-scale universe, yet tensions persist on smaller scales — from dwarf galaxy cores to the excess of galaxy–galaxy strong lensing (GGSL) anomalies in clusters. These discrepancies point to limitations in the collisionless CDM paradigm. In this talk, I will focus on self-interacting dark matter (SIDM), and in particular a two-component model with mass segregation, which offers a unified explanation for both dwarf-scale cores and GGSL anomalies. These observational clues underscore the power of lensing and other astrophysical probes in revealing the microphysics of the dark sector.
