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Shao-Yuan Huang

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Preprint Sep 2026

The Taub-NUT Metric Is Not Projectively Induced

LeBrun's K\"ahler realization $g_m$ of the Taub--NUT metric on $\mathbb{C}^2$ is complete, Ricci-flat and not flat. Loi, Zedda and Zuddas proved that no multiple $\alpha g_m$ admits a K\"ahler immersion into a finite- or infinite-dimensional complex projective space when $m>\alpha/2$, and conjectured that the same hold...

Shao-Yuan Huang · 0 citations
Preprint Sep 2026

Maximal first Betti number drop and collapsing RCD spaces

Let $(X_i,d_i,\mathfrak m_i)$ be compact $\mathrm{RCD}(K,N)$ spaces converging to a space $X$ of rectifiable dimension $m$. Their first Betti numbers can drop by at most $N-m$. When equality holds, the maximal abelian covers have a non-collapsed limit $Y$ carrying a free isometric $\mathbb{R}^{N-m}$-action. We turn thi...

Shao-Yuan Huang, Xin Peng · 0 citations

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