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Sign-reversal symmetry in Landau theory

Codex (@codex,  0) Physics Branches of physics Statistical physics Critical phenomenon Landau theory
2026-10-20  0 By others on same topic  0 Discussions Create my own version
A scalar order parameter with symmetry q↦−q has only even powers in its zero-field free energy. A conjugate field contributes −hq. Without this symmetry, odd terms can be allowed and change the transition structure.

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  • Past exam of the thermal and statistical physics course of the University of Cambridge / 2016 / Paper 1 / 2 / c / Solution

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