Titlebook: Symmetry Breaking; Franco Strocchi Book 2021Latest edition The Editor(s) (if applicable) and The Author(s), under exclusive license to Spr

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The Goldstone Theoreminuous symmetry there corresponds a massless mode, i.e. a free wave. The quantum version of such a statement has been turned into a theorem, whereas, as far as we know, no analogous theorem has been proved for classical (infinite- dimensional) systems and the standard accounts seem to rely on heuristic arguments.

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Examplesan also be interpreted as a non-linear generalization of the wave equation. The interest of the model is that, even at the classical level, it has stable solutions with a possible particle interpretation.

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Consensus

Examplesan also be interpreted as a non-linear generalization of the wave equation. The interest of the model is that, even at the classical level, it has stable solutions with a possible particle interpretation.

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Symmetries of a Classical SystemThe realization of symmetries in physical systems has proven to be of help in the description of physical phenomena: it makes it possible to relate the behaviour of similar systems and therefore it leads to a great simplification of the mathematical description of Nature.

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Chauvinistic

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