Yang Zhang

activity

20242026

collaborators

6 papers

math.AG2026

Automorphisms of odd dimensional $(2, 2)$ -complete intersections in characteristic $2$

Yang Zhang

We compute the automorphism scheme of a generic odd dimensional $(2, 2)$ -complete intersection in characteristic $2$ . This is the only case for complete intersections having a non-t…

math.AG2025

On the Non-Semipositivity of a Nef and Big Line Bundle on Grauert's Example

Yangyang Zhang

We study the relation between semipositivity, nefness, and bigness of line bundles on compact KÃ¤hler manifolds. Every nef and big line bundle on a compact KÃ¤hler manifold $X$ is…

math.AG2025

Symmetry notions for toric Fanos

Chenzi Jin, Yanir A. Rubinstein, Yang Zhang

We survey various notions of symmetry for toric varieties. These notions range from algebraic geometric, complex geometric, representation theoretic, combinatorial, convex geometri…

math.DG2025

Time Separation and Scattering Rigidity for Analytic Lorentzian Manifolds

Yuchao Yi, Yang Zhang

In this work, we prove the following three rigidity results: (i) in a real-analytic globally hyperbolic spacetime $(M, g)$ without boundary, the time separation function restricted…

math.AP2025

The Dirichlet-to-Neumann map for Lorentzian CalderÃ³n problems with data on disjoint sets

Yuchao Yi, Yang Zhang

We consider the restricted Dirichlet-to-Neumann map $I^_{g, A, q}^{U, V}$ for the wave equation with magnetic potential $A$ and scalar potential $q$ , on an admissible Lorentzian manif…

math.AP2024

Inverse Nonlinear Scattering by a Metric

Peter Hintz, AntÃ´nio SÃ¡ Barreto, Gunther Uhlmann +1

We study the inverse problem of determining a time-dependent globally hyperbolic Lorentzian metric from the scattering operator for semilinear wave equations.