• anonymous
What is phase symmetry?
  • Stacey Warren - Expert
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  • katieb
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  • missMob
Consider a particle P described by a chronologically ordered chain of events where each orbital cycle Ω can be expressed as a pair of events Ω={P∘,P∙} that are out of phase with each other so that δθ(P∘)=−δθ(P∙)=±1 Then P∘ and P∙ are called phase components of P. If these two sets are composed from the same selection of quarks, then a description of the whole cycle Ω is unaffected if there is any confusion or mix-up about the sign of the phase. This robust indifference to the phase is useful, so we give particles like this a special name. Definition: if P∘=P∙ then we say that P has phase symmetry. The most important examples of particles with phase symmetry are protons and electrons in their ground-states. So it is possible to make descriptions of protons and electrons that ignore the phase. Alternatively, if P∘=P∙¯¯¯¯¯ then we say that P has phase anti-symmetry. sun.png Sensory interpretation: when the phase indicates whether an event is diurnal or nocturnal, then indifference to phase means that a description does not depend on whether it is day or night. Physicists in different time-zones can work together in considering particles like protons and electrons. originally posted at :

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