**SMS scnews item created by James East at Wed 8 Jul 2009 1609**

Type: Seminar

Modified: Wed 8 Jul 2009 1612; Wed 8 Jul 2009 1614

Distribution: World

Expiry: 17 Jul 2009

**Calendar1: 17 Jul 2009 1205-1255**

**CalLoc1: Carslaw 375**

Auth: jamese@bari.maths.usyd.edu.au

### Algebra Seminar

# Applications of twisted Fourier-Mukai transforms

### Justin Sawon

#### Friday July 17, 12:05--12:55pm, Carslaw 375

###### Abstract

A Fourier-Mukai transform is an equivalence between the derived categories of coherent sheaves on different spaces X and Y. Mukai originally studied such transforms for abelian varieties and K3 surfaces. Geometrically, a Fourier-Mukai transform may induce a birational map between moduli spaces of stable sheaves on X and Y, which is sometimes even an isomorphism.

Often there is a gerbey obstruction to the existence of a Fourier-Mukai transform; Caldararu overcame this obstacle by incorporating the gerbe into the transform by way of twisted sheaves. In this talk, I will describe two applications of twisted Fourier-Mukai transforms to holomorphic symplectic geometry. The first proves the existence of fibrations on Hilbert schemes Hilb^nS of certain K3 surfaces S. The second gives a relative Fourier-Mukai transform between families of abelian varieties - the twist arises because these families may be non-trivial `torsors'.

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After the seminar we will take the speaker to lunch.

In addition to Justin's talk, there will also be a seminar on Monday; click here for details.

See the Algebra Seminar web page for information about other seminars in the series.

James East jamese@maths.usyd.edu.au