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From Nordan Symposia
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Symmetries which are only present at low temperatures are called [[accidental symmetry|accidental symmetries]]. For example, a symmetry which is broken by a process which requires a lot of energy, such as the creation of heavy [[virtual particles]], is an accidental symmetry at temperatures sufficiently low that this process is suppressed.
Symmetries which are only present at low temperatures are called [[accidental symmetry|accidental symmetries]]. For example, a symmetry which is broken by a process which requires a lot of energy, such as the creation of heavy [[virtual particles]], is an accidental symmetry at temperatures sufficiently low that this process is suppressed.
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