TY - GEN

T1 - How to explore a fast-changing world (cover time of a simple random walk on evolving graphs)

AU - Avin, Chen

AU - Koucký, Michal

AU - Lotker, Zvi

PY - 2008/8/14

Y1 - 2008/8/14

N2 - Motivated by real world networks and use of algorithms based on random walks on these networks we study the simple random walks on dynamic undirected graphs with fixed underlying vertex set, i.e., graphs which are modified by inserting or deleting edges at every step of the walk. We are interested in the expected time needed to visit all the vertices of such a dynamic graph, the cover time, under the assumption that the graph is being modified by an oblivious adversary. It is well known that on connected static undirected graphs the cover time is polynomial in the size of the graph. On the contrary and somewhat counter-intuitively, we show that there are adversary strategies which force the expected cover time of a simple random walk on connected dynamic graphs to be exponential. We relate this result to the cover time of static directed graphs. In addition we provide a simple strategy, the lazy random walk, that guarantees polynomial cover time regardless of the changes made by the adversary.

AB - Motivated by real world networks and use of algorithms based on random walks on these networks we study the simple random walks on dynamic undirected graphs with fixed underlying vertex set, i.e., graphs which are modified by inserting or deleting edges at every step of the walk. We are interested in the expected time needed to visit all the vertices of such a dynamic graph, the cover time, under the assumption that the graph is being modified by an oblivious adversary. It is well known that on connected static undirected graphs the cover time is polynomial in the size of the graph. On the contrary and somewhat counter-intuitively, we show that there are adversary strategies which force the expected cover time of a simple random walk on connected dynamic graphs to be exponential. We relate this result to the cover time of static directed graphs. In addition we provide a simple strategy, the lazy random walk, that guarantees polynomial cover time regardless of the changes made by the adversary.

UR - http://www.scopus.com/inward/record.url?scp=49049119314&partnerID=8YFLogxK

U2 - 10.1007/978-3-540-70575-8_11

DO - 10.1007/978-3-540-70575-8_11

M3 - Conference contribution

AN - SCOPUS:49049119314

SN - 3540705740

SN - 9783540705741

T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

SP - 121

EP - 132

BT - Automata, Languages and Programming - 35th International Colloquium, ICALP 2008, Proceedings

T2 - 35th International Colloquium on Automata, Languages and Programming, ICALP 2008

Y2 - 7 July 2008 through 11 July 2008

ER -