Termine

In this talk we compute the index homomorphism of even K-groups arising from a class in even KK-theory via the Kasparov product. Due to the seminal work of Baaj and Julg, under mild conditions on the C*-algebras in question, every class in KK-theory can be represented by an unbounded Kasparov module. We then describe the corresponding index homomorphism of even K-groups in terms of spectral localizers. This means that our explicit formula for the index homomorphism does not depend on the full spectrum of the abstract Dirac operator D, but rather on the intersection between this spectrum and a compact interval. The size of this compact interval does however reflect the interplay between the K-theoretic input and the abstract Dirac operator. Since the spectral projections for D are not available in the general context of Hilbert C*-modules we instead rely on certain continuous compactly supported functions applied to D to construct the spectral localizer. In the special case where even KK-theory coincides with even K-homology, our work recovers the pioneering work of Loring and Schulz-Baldes on the index pairing.

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The eigenvalues of the Laplacian are quantities that underlie many physical phenomena including, for instance, heat conduction or overtones of a drum. In 1974, Kac asked (and in a way answered) the question of how the eigenvalues of the Laplacian change when the underlying domain is perforated by a large number of tiny holes. Soon thereafter, Rauch and Taylor completed Kac? analysis while linking the problem to a cocktail-party-level question of how fine one should crush the ice cubes to maximize its cooling effect on a drink (read: ambient liquid). Disregarding the analogies, they concluded that the correct quantity to look at is the capacity density of the perforations; scaling the number of perforations by inverse capacity then makes the eigenvalues tend to those of an effective (deterministic) Schrödinger operator as the perforation diameters tend to zero. In the talk, I will review these findings relying at first on the classical connection to Wiener sausage which earned this problem much independent attention by probabilists over several decades. I will then proceed to discuss how one can capture the fluctuations of the eigenvalues and prove a Central Limit Theorem for the eigenvalues that are simple in the aforementioned limit. The method of proof in this part is quite different, relying largely on martingale representation and rank-one type of perturbations. For centering by expected eigenvalues the CLT holds in all dimensions 2 and above. For centering by limiting eigenvalues one has to restrict to dimensions less than 6 as non-trivial corrections arise in other cases. The talk is based on an upcoming joint work with Ryoki Fukushima (University of Tsukuba).

Spectra arise in almost all parts of mathematics, and often they reflect some essential information from an underlying category. Examples are: the spectrum of prime ideals of a commutative ring, the spectrum of (indecomposable) injective objects in a Grothendieck category, the Ziegler spectrum arising in the model theory of modules, and last but not least the Balmer spectrum of a tensor triangulated category. The talk will provide a survey about these spectra from a representation theory perspective, with a special focus on their interplay.