How to design a linear cover time random walk on a finite graph

  • Authors:

  • Yoshiaki Nonaka;Hirotaka Ono;Kunihiko Sadakane;Masafumi Yamashita

  • Affiliations:

  • Department of Informatics, Kyushu University, Japan;Department of Informatics, Kyushu University, Japan and Institute of Systems, Information Technologies and Nanotechnologies, Japan;Principles of Informatics Research Division, National Institute of Informatics, Japan;Department of Informatics, Kyushu University, Japan and Institute of Systems, Information Technologies and Nanotechnologies, Japan

  • Venue:
  • SAGA'09 Proceedings of the 5th international conference on Stochastic algorithms: foundations and applications
  • Year:
  • 2009

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Abstract

Arandom walk on a finite graph G = (V,E) is random token circulation on vertices of G. A token on a vertex in V moves to one of its adjacent vertices according to a transition probability matrix P. It is known that both of the hitting time and the cover time of the standard random walk are bounded by O(|V|3), in which the token randomly moves to an adjacent vertex with the uniform probability. This estimation is tight in a sense, that is, there exist graphs for which the hitting time and cover times of the standard random walk are Ω(|V|3). Thus the following questions naturally arise: is it possible to speed up a random walk, that is, to design a transition probability for G that achieves a faster cover time? Or, how large (or small) is the lower bound on the cover time of random walks on G? In this paper, we investigate how we can/cannot design a faster random walk in terms of the cover time. We give necessary conditions for a graph G to have a linear cover time random walk, i,e., the cover time of the random walk on G is O(|V|). We also present a class of graphs that have a linear cover time. As a byproduct, we obtain the lower bound Ω(|V| log |V|) of the cover time of any random walk on trees.