Positivity of tangent bundles of weak Del Pezzo surfaces of degree 4----Morningside Center of Mathematics Chinese Academy of Sciences

Positivity of tangent bundles of weak Del Pezzo surfaces of degree 4

Qimin Zhang

2026-08-25 15:15-16:15

MCM110

Speaker: Qimin Zhang (Université Côte d'Azur)

Title: Positivity of tangent bundles of weak Del Pezzo surfaces of degree 4

Time: 15:15-16:15 August 25, 2026 (Tuesday)

Inviter: Prof. Baohua Fu (MCM, CAS)

Place: MCM110

Abstract: In this talk, I will discuss my recent results concerning the positivity of tangent bundles of degree 4 weak Del Pezzo surfaces. Let S denote such a surface, I show that its tangent bundle T_S is almost nef. In addition, I willl also provide a classification of conic bundle structures on a given weak Del Pezzo surface. The total dual VMRT divisors associated to these conic bundle structures form the central technical tool to verify the almost nefness of T_S.