Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with A. Steger, D. Steurer and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, May 23, 2023, 12:15 pm

Duration: 30 minutes

Location: OAT S15/S16/S17

Speaker: Patryk Morawski

Bounded-degree spanning trees in randomly perturbed digraphs

In this talk I will present the results of my semester project with Kalina Petrova. We show that a randomly perturbed digraph, where we start with a dense digraph D and add a small number of random edges to it, will typically contain a fixed orientation of a bounded-degree spanning tree. This answers a question posed by Aruaujo, Balogh, Krueger, Piga and Treglown and generalizes the corresponding result for randomly perturbed graphs by Krivelevich, Kwan and Sudakov. More specifically, we prove that there exists a constant c = c(a, b) such that if T is an oriented tree with maximum degree b and D is an n-vertex digraph with minimum semidegree a*n then the graph obtained by adding cn uniformly random edges to D will contain T with high probability. Our proof involves a new technique for finding enough absorbers in the host graph D.

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