Chao Yang

activity

20222026

collaborators

8 papers

math.GR2026

Topological Characterizations of Geometrically Infinite Convergence Group Actions and Orbit Uniform Metrics

Chaodong Yang

Two characterizations of geometric finiteness in terms of weaker conditions are known for actions on Gromov hyperbolic spaces. In this paper, we establish analogous characterizatio…

math.GR2026

Two Characterizations of Geometrically Infinite Actions on Gromov Hyperbolic Spaces

Chaodong Yang, Wenyuan Yang

We provide two new characterizations of geometrically infinite actions on Gromov hyperbolic spaces: one in terms of the existence of escaping geodesics, and the other via the prese…

math.QA2025

Cofiniteness for Twisted Fusion Products in Vertex Operator Algebra Theory

Chao Yang, Yiyi Zhu

Let $V$ be a vertex operator algebra equipped with two commuting finite-order automorphisms $g_{1}$ and $g_{2}$ , and set $g_{3} = g_{1} g_{2}$ . For $k = 1, 2, 3$ , let $W^{k}$ be a $g_{k}$ -twiste…

math.QA2025

Y(z)-injective vertex superalgebras and Hopf actions

Chao Yang

This paper investigates Y(z)-injective vertex superalgebras. We first establish that two fundamental classes of vertex superalgebras -- simple ones and those admitting a PBW basis…

math.DG2024

λ-Biharmonic hypersurfaces in the product space L^{m}\times \mathbb{R}

Chao Yang, Zhen Zhao

In this paper, we study λ-biharmonic hypersurfaces in the product space L^{m}\times\mathbb{R}, where L^{m} is an Einstein space and \mathbb{R} is a real line. We prove that λ-bihar…

math.DG2024

PMCV hypersurfaces in non-flat pseudo-Riemannian space forms

Chao Yang, Jiancheng Liu, Li Du

In this paper, we prove that PMCV (i.e. Δ\vec{H} is proportional to \vec{H}) hypersurface M^n_r of a non-flat pseudo-Riemannian space form N^{n+1}_s(c) with at most two distinct pr…

math.DG2023

Four dimensional hypersurfaces with proper mean curvature vector field in pseudo-Riemannian space forms

Chao Yang, Jiancheng Liu, Li Du

In this paper, we study four dimensional hypersurface M^4_r with proper mean curvature vector field (i.e. Δ\vec{H} is proportional to \vec{H}) in pseudo-Riemannian space form N^5_s…

math.QA2022

Endomorphism property of vertex operator algebras over arbitrary fields

Chao Yang, Jianqi Liu

In this paper, we study the endomorphism properties of vertex operator algebras over an arbitrary field $F$ , with $Char (F) \neq = 2$ . Let $V$ be a strongly f…