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Green Operators on Static Spacetimes with Timelike Boundary

20.06.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Onirban Islam

I shall introduce the Chazarain method to construct retarded and advanced Green operators for a Dirac operator on a globally hyperbolic spacetime with timelike boundary.

zu den Veranstaltungen

Anschrift

Universität Potsdam
Institut für Mathematik
Campus Golm, Haus 9
Karl-Liebknecht-Str. 24-25
D-14476 Potsdam

Aktivitäten

14.11.2025, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Absolutely convergent cyclotomic conical zeta values

Bin Zhang (Chengdu) (online)

Zeta values which are discrete sums on the one dimensional cone \(]0, +\infty[\) generalise to multizeta values which are discrete sums on\( k\)-dimensional Chen cones \(0<x_k<\cdots<x_1\) with \(k\)... 

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19.11.2025, 13:00 Uhr  –  Haus 9, Raum 2.22
Forschungsseminar Diskrete Spektraltheorie

Calculus of variations for nonlocal Sobolev–Bregman forms

Artur Rutkowski

The Sobolev–Bregman integral forms are an \(L^p\) version of quadratic forms defining the fractional Sobolev spaces \(H^s\), that emerged in a natural way from the probabilistic potential theory in... 

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20.11.2025, 16:15  –  Campus Golm, Haus 9, Raum 1.22
Forschungsseminar Differentialgeometrie

Codimension 2 transfer of signatures in L theory

Yuetong Luo (Göttingen)

The signature of a closed manifold is an important invariant in geometric topology. Recently, Higson, Xie, and Schick proved an invariance theorem for the K-theoretic signature in codimension 2. They... 

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20.11.2025, 13:00 Uhr  –  Haus 9, Raum 2.22
Forschungsseminar Diskrete Spektraltheorie

The Bregman variation of semimartingales

Katarzyna Pietruska-Paluba

We introduce a generalization of the quadratic variation of a (semi)martingale: the increments of a process will be measured with the so-called Bregman divergence (instead of the quadratic function).... 

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24.11.2025, 14:00 - 15:00 Uhr  –  2.14.0.21
Forschungsseminar: Gruppen und Operatoralgebren

Cuntz-Pimsner algebras of homeomorphisms twisted by vector bundles

Aaron Kettner (Czech Academy of Sciences)

Abstract:

In this talk, I will show how to construct a C*-correspondence from a
vector bundle together with a (partial) homeomorphism on the bundle's
base space. The associated Cuntz-Pimsner algebras... 

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