English

Brauer group of punctual Quot scheme of points on a smooth projective surface

Algebraic Geometry 2019-11-11 v1

Abstract

Let XX be a smooth projective surface over an algebraically closed field kk such that char(k)2char(k) \neq 2. Let X[d]X^{[d]} denote the punctual Hilbert scheme of zero dimensional quotients of degree dd and X(d)X^{(d)} denote the symmetric product of XX. For 2\ell \neq 2, we give a formula for the \ell-primary part of the Brauer group of X[2]X^{[2]}. We show that the Hilbert to Chow morphism induces an isomorphism of cohomological Brauer groups for d=2d=2 and a similar result for d3d \geq 3. Let Q(r,d)Q(r,d) denote the punctual Quot-scheme parametrising zero dimensional quotients of OXr\mathcal{O}_X^{ \oplus r} of degree dd. We show that the natural morphism from Q(r,d)X[d]Q(r,d) \rightarrow X^{[d]} induces an isomorphism on cohomological Brauer groups.

Keywords

Cite

@article{arxiv.1911.02866,
  title  = {Brauer group of punctual Quot scheme of points on a smooth projective surface},
  author = {A. J. Parameswaran and Yashonidhi Pandey},
  journal= {arXiv preprint arXiv:1911.02866},
  year   = {2019}
}