AbstractIn this talk, we study the special fiber of U(2r, 1) Shimura varieties at an inert prime. We exhibitelements in the higher Chow group of the supersingular locus and use this to prove the surjectivityof the arithmetic level-raising map. A key ingredient of the proof is to show a form of lharas lemmafor odd definite unitary groups. The proof relies heavily on the description of supersingu...
BIMSA-YMSC Number Theory Lunch SeminarThis is an in-person seminar at BIMSA over lunch, aimed to promote communications in the Number Theory teams at BIMSA and YMSC. Each talk is 45 minutes long and does not focus on research results. Instead, we encourage each speaker to discuss either (1) a basic notion in Number Theory or related fields or (2) applications or computational aspects of Number ...