Seminari Al@Bicocca: Ettore Marmo

Toric arrangements and Bloch-Kato pro-p groups
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algebra in bicocca

Lunedì 1° Dicembre 2025 alle ore 15:00, nel quadro del ciclo di seminari Al@Bicocca, Ettore Marmo (Università degli Studi di Milano-Bicocca) terrà il seguente intervento

Titolo: Toric arrangements and Bloch-Kato pro-p groups

Abstract: The absolute Galois group of a field K is defined as the Galois group of the distinguished extension Ksep/K given by the separable closure. A challenging problem in modern Galois theory is to recognize which pro-p groups can be realized as maximal pro-p quotients of an absolute Galois group. Such pro-p groups must satisfy a rather strong cohomological condition called Bloch-Kato property. In this talk we will discuss some obstructions to this property for a class of pro-p groups arising as the pro-p completion of fundamental groups of toric arrangement complements. As an application, we will prove that for all primes p, the pro-p completion of the pure braid groups on n ≥ 4 strands do not satisfy the Bloch-Kato property.

Informazioni per partecipare

Il seminario si terrà in Aula U6-24 (Edificio U6 | 1° Piano | Piazza dell'Ateneo Nuovo 1, Milano) e sarà possibile partecipare anche online da questo link.

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