Author

Heng Zhang

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Preprint Sep 2026

Immersed hypersurfaces with positive first Newton transformation

We prove that every closed cooriented hypersurface immersion in $\R^{n+1}$, $n\ge 2$, with positive definite first Newton transformation bounds a compact immersed manifold with the prescribed boundary map and outward coorientation. Combined with the rigidity results of Ros and Pinkall, this filling theorem implies that...

Jiang-Cheng You, Heng Zhang · 0 citations

Preprint Jul 2026

Uniform Comparison of Hyperbolic Ball Volumes on the Universal Cover

Let $\|M\|_{\Delta}$ denote the simplicial volume of $M$, $V_r(X,h)=\sup_{x\in X}\operatorname{Vol}_h\big(B_h(x,r)\big)$, and $\mathbb{H}^n$ denotes hyperbolic $n$-space. We prove that, if a closed oriented $n$-manifold $M$ admits a hyperbolic metric, then there is a dimensional constant $\delta_n>0$ such that every Ri...

Heng Zhang · 0 citations