English

Weighted hypersurfaces with either assigned volume or many vanishing plurigenera

Algebraic Geometry 2012-03-14 v2

Abstract

In this paper we construct, for every n, smooth varieties of general type of dimension n with the first n23\lfloor \frac{n-2}{3} \rfloor plurigenera equal to zero. Hacon-McKernan, Takayama and Tsuji have recently shown that there are numbers rnr_n such that, for all r > rnr_n, the r-canonical map of every variety of general type of dimension n is birational. Our examples show that rnr_n grows at least quadratically as a function of n. Moreover they show that the minimal volume of a variety of general type of dimension n is smaller than 3n+1(n1)n\frac{3^{n+1}}{(n-1)^{n}}. In addition we prove that for every positive rational number q there are smooth varieties of general type with volume q and dimension arbitrarily big.

Keywords

Cite

@article{arxiv.1102.3105,
  title  = {Weighted hypersurfaces with either assigned volume or many vanishing plurigenera},
  author = {E. Ballico and R. Pignatelli and L. Tasin},
  journal= {arXiv preprint arXiv:1102.3105},
  year   = {2012}
}

Comments

7 pages; v2: minor corrections, final version to be published in Communications in Algebra