Weighted Pebbling Numbers of Graphs

Joshua D. Laison1, Cam McLeman2, Kathryn L. Nyman1, Stephanie Partlow1
1DEPARTMENT OF MATHEMATICS, WILLAMETTE UNIVERSITY, 900 STATE ST., SALEM, OR 97301
2DEPARTMENT OF MATHEMATICS, THE UNIVERSITY OF MICHIGAN-FLINT, 303 E. KEARS- LEY STREET, FLINT, MI 48502

Abstract

We expand the theory of pebbling to graphs with weighted edges. In a weighted pebbling game, one player distributes a set amount of weight on the edges of a graph and his opponent chooses a target vertex and places a configuration of pebbles on the vertices. Player one wins if, through a series of pebbling moves, he can move at least one pebble to the target. A pebbling move of \(p\) pebbles across an edge with weight \(w\) leaves \(\lfloor pw \rfloor\) pebbles on the next vertex. We find the weighted pebbling numbers of stars, graphs with at least \(2|V|-1\) edges, and trees with given targets. We give an explicit formula for the minimum total weight required on the edges of a length-2 path, solvable with \(p\) pebbles, and exhibit a graph that requires an edge with weight \(1/3\) in order to achieve its weighted pebbling number.

Keywords: pebbling number, weighted pebbling number 2010 Mathematics Subject Classification. 05C57, 05C22, 05C05, 05C38