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Swap Equilibria under Link and Vertex Destruction

Department of Computer Science, Kiel University, Christian-Albrechts-Platz 4, 24118 Kiel, Germany
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Academic Editors: Klaus Ritzberger, Ryuhei Uehara, John W. Patty and Ulrich Berger
Games 2017, 8(1), 14; https://doi.org/10.3390/g8010014
Received: 3 December 2016 / Revised: 6 February 2017 / Accepted: 14 February 2017 / Published: 22 February 2017
We initiate the study of the destruction or adversary model (Kliemann 2010) using the swap equilibrium (SE) stability concept (Alon et al., 2010). The destruction model is a network formation game incorporating the robustness of a network under a more or less targeted attack. In addition to bringing in the SE concept, we extend the model from an attack on the edges to an attack on the vertices of the network. We prove structural results and linear upper bounds or super-linear lower bounds on the social cost of SE under different attack scenarios. For the case that the vertex to be destroyed is chosen uniformly at random from the set of max-sep vertices (i.e., where each causes a maximum number of separated player pairs), we show that there is no tree SE with only one max-sep vertex. We conjecture that there is no tree SE at all. On the other hand, we show that for the uniform measure, all SE are trees (unless two-connected). This opens a new research direction asking where the transition from “no cycle” to “at least one cycle” occurs when gradually concentrating the measure on the max-sep vertices. View Full-Text
Keywords: network formation game; swap equilibrium; adversary model; destruction model; graph connectivity; network robustness network formation game; swap equilibrium; adversary model; destruction model; graph connectivity; network robustness
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Kliemann, L.; Shirazi Sheykhdarabadi, E.; Srivastav, A. Swap Equilibria under Link and Vertex Destruction. Games 2017, 8, 14.

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