Nonvanishing of conformal blocks divisors on $\bar{M}_{0,n}$
Abstract
We introduce and study the problem of finding necessary and sufficient conditions under which a conformal blocks divisor on is nonzero. We give necessary conditions in type A, which are sufficient when theta and critical levels coincide. We show that divisors are subject to additive identities, dependent on ranks of the underlying bundle. These identities amplify vanishing and nonvanishing results and have other applications.
Keywords
Cite
@article{arxiv.1410.2459,
title = {Nonvanishing of conformal blocks divisors on $\bar{M}_{0,n}$},
author = {Prakash Belkale and Angela Gibney and Swarnava Mukhopadhyay},
journal= {arXiv preprint arXiv:1410.2459},
year = {2014}
}
Comments
arXiv:1308.4906 has been broken up into two parts: p1: "Vanishing and identities of conformal blocks divisors" (Algebraic Geometry to appear) replaces arXiv:1308.4906. The present upload is p2: "Nonvanishing of conformal blocks divisors on $\bar{M}_{0,n}$". In v2, added Lemma 3.7 and removed an incorrect use of zeroth Chern class in Introduction