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Derived categories of genus one curves and torsors over abelian varieties

CMSA EVENTS: CMSA ALGEBRAIC GEOMETRY IN STRING THEORY SEMINAR

When: April 4, 2024
10:30 am - 11:30 am
Where: CMSA, 20 Garden St, G10
Address: 20 Garden Street, Cambridge, MA 02138, United States
Speaker: Jonathan Rosenberg - University of Maryland

Studying orientifold string theories on elliptic curves or abelian varieties motivates studying the derived category of coherent sheaves on a genus one curve or a torsor over an abelian variety over the reals (as opposed to the complex numbers).
In joint work with Nirnajan Ramachandran (to appear in MRL), we show that a genus one curve over a perfect field determines a class in the relative Brauer group of the Jacobian elliptic curve, and that there is a natural Mukai-type derived equivalence between the original genus one curve and the Jacobian twisted by the Brauer class.  The proof extends to torsors over abelian varieties (of any dimension).