Pradeep Kumar Banerjee (MPI MIS, Leipzig): Computing the unique information
Jan 17 @ 14:00 – 15:30

Given a set of predictor variables and a response variable, how much information do the predictors have about the response, and how is this information distributed between unique, complementary, and shared components? Recent work has proposed to quantify the unique component of the decomposition as the minimum value of the conditional mutual information over a constrained set of information channels. We present an efficient iterative divergence minimization algorithm to solve this optimization problem with convergence guarantees, and we evaluate its performance against other techniques.
Joint work with Johannes Rauh and Guido Montúfar (https://arxiv.org/abs/1709.07487)

Stefan Thurner (Medical University of Vienna, Austria): Entropy for complex systems
Jan 18 @ 15:00 – 16:30
Ulrich Menne (Leipzig): Weakly differentiable functions on generalised submanifolds with mean curvature
Jan 18 @ 15:15 – 16:45

In general dimensions, weak solutions of the Euler Lagrange equation of the area functional are naturally constructed in the class of integral varifolds. As the regularity theory of area-stationary integral varifolds is still substantially incomplete, it is important to enlarge the related mathematical machinery, both to handle the possible singularities and to advance regularity theory.

In this regard, the talk will survey the implementation of the concept of weakly differentiable functions on integral varifolds of locally bounded first variation of area. The present theory of Sobolev spaces on metric measure spaces turns out to ill-adapted for this purpose. Instead, a coherent theory can be constructed by defining a non-linear class of functions taking into account the extrinsic geometry of the varifold. The inclusion of non-vanishing first variation therein is not only theoretically preferable but is also important for the needs of problems from applied analysis.

Matteo Smerlak (MPI MIS, Leipzig): Universality classes of natural selection
Jan 18 @ 16:30 – 17:30

Natural selection begets adaptation through the exponential amplification of initially rare, highly fit lineages. As such, it bears strong ressemblance with topics such as extreme value theory (dominance of extreme events) and coarsening dynamics (dominance of large structures); like them, natural selection mathematical theory is structured by a basic limit theorem. I will present that theorem and discuss its potential application to detect statistical signatures of selection in empirical data.

Vitalii Konarovskyi (Universität Leipzig): A particle model for Wasserstein type diffusion
Jan 19 @ 11:00 – 12:30

Vortrag in der Reihe: Arbeitsgemeinschaft ANGEWANDTE ANALYSIS
In the talk we will present an interacting particle model on the real line which has a connection with the geometry of Wasserstein space. The model is a natural generalization of the coalescing Brownian motions but now particles can sticky-reflected from each other. The fundamental new feature is that particles carry mass which is aggregated as more and more particles occupy the same position and which determines the diffusivity of the individual particle in inverse proportional way. We are going to present the infinite dimensional SDE with discontinuous coefficients which describes the particle model. We will discuss the existence of a weak solution such an equation, using a finite particle approximation. Also the stationary case will be considered and an invariant measure will be constructed. Joint work with Max von Renesse.

Wilhelm Singhof (Heinrich-Heine-Universität Düsseldorf, Germany): Maryam Mirkzakhani – Ruhm und früher Tod einer Mathematikerin
Jan 22 @ 19:00 – 22:00

Vortrag in der Reihe: Leipziger Gespräche zur Mathematik
Abstract zu dieser Veranstaltung (PDF-Datei)

Madeleine Weinstein (University of California, Berkeley), Emil Horobet (Târgu-Mureş – Sapientia Hungarian University of Transylvania): Offset hypersurfaces and persistent homology of algebraic varieties
Jan 23 @ 10:00 – 11:00

In this talk we present connections between the true persistent homology of algebraic varieties and their corresponding offset hypersurfaces. By Hardt’s theorem, true persistent homology events occur at algebraic numbers. By studying the offset hypersurface, we characterize when true persistent homology events occur. The degree of the offset hypersurface is bounded by the Euclidean Distance Degree of the starting variety, so this way we show a bound on the degree of the algebraic numbers at which the homological events occur.

Günther Grün (Friedrich-Alexander-Universität Erlangen-Nürnberg): Some remarks on stochastic thin-film equations
Jan 23 @ 15:15 – 16:45

Vortrag in der Reihe: Oberseminar ANALYSIS – PROBABILITY
Abstract zu dieser Veranstaltung (PDF-Datei)

Volker Betz (TU Darmstadt): Long cycles in Spatial Random Permutations. Main challenges and some results
Jan 23 @ 16:45 – 18:15

Vortrag in der Reihe: Oberseminar ANALYSIS – PROBABILITY
I will introduce the model of spatial random permutations and talk about its connection to quantum physics, in particular to systems of interacting bosons. I will present the main open questions in the theory, and report on the (small) progress that has been made towards understanding some aspects of the model.

Haitian Yue (University of Massachusetts): to be announced
Jan 25 @ 14:15 – 15:45

Vortrag in der Reihe: Arbeitsgemeinschaft ANGEWANDTE ANALYSIS

Florentin Münch (Universität Potsdam, Germany): Ollivier-Ricci curvature, number of ends, and max flow min cut principle
Jan 25 @ 15:00 – 16:00

We prove that graphs with non-negative Ollivier-Ricci curvature have at most two ends. To do so, we employ the max flow min cut theorem for constructing Busemann type functions which turn out to be harmonic. As a corollary, we show that graphs with non-negative Ricci curvature and two ends are recurrent.

Michael Dymond (Innsbruck): TBA
Jan 25 @ 15:15 – 16:45
Christian Rose (TU Chemnitz, Germany): Heat kernels and integral Ricci curvature bounds
Jan 25 @ 16:15 – 17:15

Gaussian heat kernel bounds play a fundamental role in geometric analysis. We present recent results on explicit Gaussian upper bounds for non-compact manifolds depending on locally uniform Ricci curvature integral assumptions. Furthermore, we discuss generalizations of integral curvature bounds in terms of the so-called Kato class. If time allows, topological applications of those heat kernel upper bounds will be given.

Letzte Änderung: 15. Mai 2013