Graduate seminar: Oberseminar on the Atiyah-Patodi-Singer index theorem (online) - Details
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General information

Course name Graduate seminar: Oberseminar on the Atiyah-Patodi-Singer index theorem (online)
Course number 503109
Semester WiSe 2020/21
Current number of participants 19
expected number of participants 15
Home institute Bereich Mathematik
Courses type Graduate seminar in category Teaching
Preliminary discussion Fri., 09.10.2020 16:15 - 17:00
First date Fri., 09.10.2020 16:15 - 17:00
Learning organisation This seminar will be a joined seminar between the University of Göttingen the University of Augsburg and therefore be held online only.

Course location / Course dates

n.a. Tuesday: 14:15 - 15:45, weekly(11x)
Fri., 09.10.2020 16:15 - 17:00
Mon , 30.11.2020 (all-day)

Fields of study


Consider a (linear) partial differential equation P (u) = g on a subset X of euclidean space with smooth boundary Y or more generally, on a smooth manifold with boundary (X, Y). It is natural to impose boundary conditions (also in view of applications). Furthermore, in contrast to linear equations between finite dimensional vector spaces (of the same dimension), uniqueness of a solution does not imply its existence (and vice versa). This is obstructed by the index of the operator P , which makes the index an object of fundamental interest. Another motivation to study indices of differential operators comes from geometry: Often the differential operator is motivated from the geometry and the index will carry geometrical information within itself. For example, the non-vanishing of the Atiyah-Singer-Dirac Operator on a closed manifold give an obstruction for a manifold to admit positive scalar curvature. In this seminar we set out to understand what good boundary are and how to get a grip on the index problem, primary for (generalised) Dirac operators. In a preparatory first talk we introduce (review) the necessary material on unbounded operators and pseudodifferential operators. After a short discussion of Clifford and Spinor bundles, we will define generalised Dirac operators and prove several analytical properties of them, for example, solutions of Dirac operators satisfy an identity theorem, like holomorphic functions. After some analytical preparation, will introduce elliptic boundary condition and, quite ambitiously, strive for the proof of the Atiyah-Patodi-Singer index formula, which relates the index of the operator P to the underlying geometry of X and its restriction to the boundary.