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Conference Papers Year : 2014

Tight Bounds for Rumor Spreading with Vertex Expansion

Abstract

We establish a bound for the classic PUSH-PULL rumor spreading protocol on general graphs, in terms of the vertex expansion of the graph. We show that O(log^2 (n) / α) rounds suffice with high probability to spread a rumor from any single node to all n nodes, in any graph with vertex expansion at least α. This bound matches a known lower bound, and settles the natural question on the relationship between rumor spreading and vertex expansion asked by Chierichetti, Lattanzi, and Panconesi (SODA 2010). Further, some of the arguments used in the proof may be of independent interest, as they give new insights, for example, on how to choose a small set of nodes in which to plant the rumor initially, to guarantee fast rumor spreading.
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Dates and versions

hal-01097140 , version 1 (19-12-2014)

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George Giakkoupis. Tight Bounds for Rumor Spreading with Vertex Expansion. 25th ACM-SIAM Symposium on Discrete Algorithms (SODA), Jan 2014, Portland, OR, United States. pp.801 - 815, ⟨10.1137/1.9781611973402.59⟩. ⟨hal-01097140⟩
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