Topology and phase transitions: a paradigmatic evidence

Details Topology and phase transitions: a paradigmatic evidence Topology and phase transitions: a paradigmatic evidence

1999-11-16

arxiv.org/abs/cond-mat/9911235v1

Phys.Rev.Lett.84:2774-2777,2000

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.84.2774

We report upon the numerical computation of the Euler characteristic \chi (a topologic invariant) of the equipotential hypersurfaces \Sigma_v of the configuration space of the two-dimensional lattice $\phi^4$ model. The pattern \chi(\Sigma_v) vs. v (potential energy) reveals that a major topology change in the family {\Sigma_v}_{v\in R} is at the origin of the phase transition in the model considered. The direct evidence given here - of the relevance of topology for phase transitions - is obtained through a general method that can be applied to any other model.

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