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**Randomness in Topology and its Applications**## Large deviation principle for geometric and topological functionals and associated point processes

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Takashi Owada, Purdue University
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**Monday, March 20, 2023**

**Abstract**:

We prove a large deviation principle for the point process associated to k-element connected components in R^d with respect to the connectivity radii decaying to 0. The random points are generated from a homogeneous Poisson point process or the corresponding binomial point process, so that the connecting radius is of the sparse regime. The rate function for the obtained large deviation principle can be represented as relative entropy. As an application, we deduce large deviation principles for various functionals and point processes appearing in stochastic geometry and topology. As concrete examples of topological invariants, we consider persistent Betti numbers of geometric complexes and the number of Morse critical points of the min-type distance function. The large deviation principle for the volume of k-nearest neighbor balls is also discussed.

This is joint work with Christian Hirsch.