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Arithmetic of zero-cycles on products of Kummer varieties and K3 surfaces

Date: Tuesday, September 18, 2018 13:00 - 15:00
Speaker: Francesca Balestrieri (Max Planck Instiute)
Location: Big Seminar room Ground floor / Office Bldg West (I21.EG.101)
Series: Mathematics and CS Seminar
Host: Timothy Browning
Contact: WHEATLEY Susanne
Lab building west seminar room

Abstract:

In the first part of the talk, I will introduce some of the strategies used when studying the arithmetic of rational points and zero-cycles on varieties over number fields. In particular, I will talk about local-global principles and obstruction sets (e.g. the Brauer-Manin set), and I will explain how one could use the theory of obstruction sets to classify varieties according to the arithmetic behaviour of their rational points and zero-cycles.In the second part of the talk, I will present the following joint work with Rachel Newton. In the spirit of some results by Yongqi Liang, we relate the arithmetic of rational points to that of zero-cycles for the class of Kummer varieties. In particular, if X is any Kummer variety over a number field k, we show that if the BrauerManin obstruction is the only obstruction to the existence of rational points on X over all finite extensions of k, then the BrauerManin obstruction is the only obstruction to the existence of a zero-cycle of any odd degree on X. Building on this result and on some other recent results by Ieronymou, Skorobogatov and Zarhin, we further prove a similar Liang-type result for products of Kummer varieties and K3 surfaces over k.

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