English

A new geometric approach to problems in birational geometry

Algebraic Geometry 2009-11-13 v1 Differential Geometry

Abstract

A classical set of birational invariants of a variety are its spaces of pluricanonical forms and some of their canonically defined subspaces. Each of these vector spaces admits a typical metric structure which is also birationally invariant. These vector spaces so metrized will be referred to as the pseudonormed spaces of the original varieties. A fundamental question is the following: given two mildly singular projective varieties with some of the first variety's pseudonormed spaces being isometric to the corresponding ones of the second variety's, can one construct a birational map between them which induces these isometries? In this work a positive answer to this question is given for varieties of general type. This can be thought of as a theorem of Torelli type for birational equivalence.

Keywords

Cite

@article{arxiv.0811.2965,
  title  = {A new geometric approach to problems in birational geometry},
  author = {Chen-Yu Chi and Shing-Tung Yau},
  journal= {arXiv preprint arXiv:0811.2965},
  year   = {2009}
}

Comments

13 pages, to appear in PNAS

R2 v1 2026-06-21T11:42:58.863Z