Localization game for random geometric graphs. (February 2023)

• Record Type: Journal Article
• Authors: Lichev, Lyuben; Mitsche, Dieter; Prałat, Paweł
• Is Part Of: European journal of combinatorics. Volume 108(2023)
• Publication Date: 2023-02
• Subjects: Combinatorial analysis -- Periodicals; Analyse combinatoire -- Périodiques; Combinatorial analysis; Periodicals; Electronic journals; 511.6
• DOI: 10.1016/j.ejc.2022.103616
• Languages: English
• ISSNs: 0195-6698

Abstract

Abstract: The localization game is a two player combinatorial game played on a graph G = ( V, E ) . The cops choose a set of vertices S 1 ⊆ V with | S 1 | = k . The robber then chooses a vertex v ∈ V whose location is hidden from the cops, but the cops learn the graph distance between the current position of the robber and the vertices in S 1 . If this information is sufficient to locate the robber, the cops win immediately; otherwise the cops choose another set of vertices S 2 ⊆ V with | S 2 | = k, and the robber may move to a neighboring vertex. The new distances to the robber are presented, and if the cops can deduce the new location of the robber based on all information they accumulated thus far, then they win; otherwise, a new round begins. If the robber has a strategy to avoid being captured, then she wins. The localization number is defined to be the smallest integer k so that the cops win the game. In this paper we determine the localization number (up to poly-logarithmic factors) of the random geometric graph G ∈ G ( n, r ) slightly above the connectivity threshold.