Jisho

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自発的対称性
Wikipedia definition
1. Spontaneous symmetry breakingSpontaneous symmetry breaking is a spontaneous process by which a system in a symmetrical state ends up in an asymmetrical state. Consider the bottom of an empty wine bottle, a symmetrical upward dome with a gutter for sediment. If a ball is placed at the peak of the dome, the situation is symmetrical. But the ball may spontaneously break this symmetry and roll into the gutter, a point of lowest energy. The bottle and the ball retain their symmetry, but the system does not.
Read “Spontaneous symmetry breaking” on English Wikipedia
Read “自発的対称性の破れ” on Japanese Wikipedia
Read “Spontaneous symmetry breaking” on DBpedia

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