Ising model versus normal form game

Details Ising model versus normal form game Ising model versus normal form game

2009-10-27

arxiv.org/abs/0910.5139v1

S. Galam and B. Walliser, Physica A 389 (2010) 481-489

Physics

Physics and Society

19 pages, no figure

Scientific paper

The 2-spin Ising model in statistical mechanics and the 2x2 normal form game in game theory are compared. All configurations allowed by the second are recovered by the first when the only concern is about Nash equilibria. But it holds no longer when Pareto optimum condiderations are introduced like in the prisoner's dilemma. This gap can nevertheless be filled by adding a new coupling term to the Ising model, even if that term has up to now no physical meaning. An individual complete bilinear objective function is thus found to be sufficient to reproduce all possible configurations of a 2x2 game. Using this one-to-one mapping, new perspectives for future research in both fields can be envisioned.

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