English

Deformation limit and bimeromorphic embedding of Moishezon manifolds

Algebraic Geometry 2020-09-30 v3 Commutative Algebra Complex Variables Differential Geometry

Abstract

Let π:XΔ\pi: \mathcal{X}\rightarrow \Delta be a holomorphic family of compact complex manifolds over an open disk in C\mathbb{C}. If the fiber π1(t)\pi^{-1}(t) for each nonzero tt in an uncountable subset BB of Δ\Delta is Moishezon and the reference fiber X0X_0 satisfies the local deformation invariance for Hodge number of type (0,1)(0,1) or admits a strongly Gauduchon metric introduced by D. Popovici, then X0X_0 is still Moishezon. We also obtain a bimeromorphic embedding XPN×Δ\mathcal{X}\dashrightarrow\mathbb{P}^N\times\Delta. Our proof can be regarded as a new, algebraic proof of several results in this direction proposed and proved by Popovici in 2009, 2010 and 2013. However, our assumption with 00 not necessarily being a limit point of BB and the bimeromorphic embedding are new. Our strategy of proof lies in constructing a global holomorphic line bundle over the total space of the holomorphic family and studying the bimeromorphic geometry of π:XΔ\pi:\mathcal{X}\rightarrow \Delta. S.-T. Yau's solutions to certain degenerate Monge--Amp\`ere equations are used.

Keywords

Cite

@article{arxiv.1901.10627,
  title  = {Deformation limit and bimeromorphic embedding of Moishezon manifolds},
  author = {Sheng Rao and I-Hsun Tsai},
  journal= {arXiv preprint arXiv:1901.10627},
  year   = {2020}
}

Comments

Final version to appear in Communications in Contemporary Mathematics. All comments are welcome. 36 pages