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Maximal Steiner Trees in the Stochastic Mean-Field Model of Distance

Part of: Operations research and management science Graph theory Combinatorial probability

Published online by Cambridge University Press:  27 July 2017

A. DAVIDSON  and
A. GANESH
A. DAVIDSON
Affiliation:
School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, UK (e-mail: angus.davidson@bristol.ac.uk)
A. GANESH
Affiliation:
School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, UK (e-mail: a.ganesh@bristol.ac.uk)
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Abstract

Consider the complete graph on n vertices, with edge weights drawn independently from the exponential distribution with unit mean. Janson showed that the typical distance between two vertices scales as log n/n, whereas the diameter (maximum distance between any two vertices) scales as 3 log n/n. Bollobás, Gamarnik, Riordan and Sudakov showed that, for any fixed k, the weight of the Steiner tree connecting k typical vertices scales as (k − 1)log n/n, which recovers Janson's result for k = 2. We extend this to show that the worst case k-Steiner tree, over all choices of k vertices, has weight scaling as (2k − 1)log n/n and finally, we generalize this result to Steiner trees with a mixture of typical and worst case vertices.

MSC classification

Primary: 60C05: Combinatorial probability
Secondary: 05C80: Random graphs 90B15: Network models, stochastic
Type
Paper
Information
Combinatorics, Probability and Computing , Volume 26 , Issue 6 , November 2017 , pp. 826 - 838
Copyright
Copyright © Cambridge University Press 2017 

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