March 2020 - Notiziario - Mailing list — Dipartimento di Matematica, UniPI

[Settimanale] I Seminari del Dipartimento di Matematica
by www.dm.unipi.it/ 27 Mar '20

27 Mar '20

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[Settimanale] I Seminari del Dipartimento di Matematica
by www.dm.unipi.it/ 20 Mar '20

20 Mar '20

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[Settimanale] I Seminari del Dipartimento di Matematica
by www.dm.unipi.it/ 13 Mar '20

13 Mar '20

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[Settimanale] I Seminari del Dipartimento di Matematica
by www.dm.unipi.it/ 06 Mar '20

06 Mar '20

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[Settimanale] Avviso seminari di matematica, proff. David Rydh e Roberto Pirisi (4.03.2020)
by Valeria Giuliani 03 Mar '20

03 Mar '20

*AVVISO SEMINARI DI MATEMATICA* ------------------------------ Data: mercoledì 4 MARZO 2020 Luogo: Aula Magna del Dipartimento di Matematica di Pisa Programma: 15:00--16:00 David Rydh (Stockholm): Derived blow-ups and deformation to the normal cone Abstract: I will describe the functor of points of blow-ups and deformations to the normal cone using derived algebraic geometry. One application is a natural and easy construction of virtual fundamental classes and virtual pull-backs. Another potential application is to Kirwan partial desingularization and the generalized DT-invariants recently constructed by Kiem, Li and Savvas. This is joint work with A. Khan. 16:00--16:30 Coffee break 16:30--17:30 Roberto Pirisi (Stockholm): Brauer groups of moduli of hyperelliptic curves, via cohomological invariants Abstract: We use the theory of cohomological invariants for algebraic stacks to completely describe the Brauer group of the moduli stacks H_g of genus g hyperellitic curves over fields of characteristic zero, and the prime-to-char(k) part in positive characteristic. It turns out that the (non-trivial part of the) group is generated by cyclic algebras, by an element coming from a map to the classifying stack of étale algebras of degree 2g+2, and when g is odd by the Brauer-Severi fibration induced by taking the quotient of the universal curve by the hyperelliptic involution. This paints a richer picture than in the case of elliptic curves, where all non-trivial elements come from cyclic algebras. This is joint work with Andrea di Lorenzo. -- Hai ricevuto questo messaggio perché sei iscritto al gruppo "Matematici.Esterni.SNS" di Google Gruppi. Per annullare l'iscrizione a questo gruppo e non ricevere più le sue email, invia un'email a matematici.esterni.sns+unsubscribe(a)sns.it. Per visualizzare questa discussione sul Web, visita https://groups.google.com/a/sns.it/d/msgid/matematici.esterni.sns/CAGKKDBk0…. _______________________________________________ Settimanale mailing list Settimanale(a)fields.dm.unipi.it https://fields.dm.unipi.it/listinfo/settimanale

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