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On p-adic Langlands program and geometry

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DMV-PTM Mathematical Meeting 17–20.09.2014, Pozna´n

On p-adic Langlands program and geometry

Przemys law Chojecki University of Oxford, England chojecki@math.jussieu.fr Session: 3. Arithmetic Geometry

Let l and p be two prime numbers. The Langlands program aims to estab- lish a bijection with good properties between l-adic representations of absolute Galois groups of number fields (respectively, p-adic local fields; this is the lo- cal case) and l-adic representations attached to automorphic representations of reductive groups over number fields (respectively, certain smooth l-adic repre- sentations of reductive groups over p-adic fields). This domain of research has seen a spectacular progress during last two decades culminating in establish- ing the existence of the desired correspondence for GLn, when l 6= p (work of Harris and Taylor).

The p-adic local Langlands corresponcence focuses on the local case when l = p. This turns out to be much harder than the l 6= p case and demands different technical tools. As for now, the p-adic correspondence is known only in the case of GL2(Qp) (by works of Berger, Breuil, Colmez, Emerton, Kisin, Paskunas and many others). There is a growing interest in generalizing this correspondence to other groups, especially because of many potential number- theoretic applications.

In our talk, we shall review recent progress in this theory, together with the latest technical input: completed cohomology of Emerton and perfectoid spaces of Scholze.

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