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Tagged with collective-excitations symmetry
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Symmetry of momentum distribution in trapped BEC
Is the momentum distribution of excitations in a BEC symmetric? Even if there is a step potential (which I think should not make a difference because this is in real space)? I think yes, because ...
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Why does the breaking of a 'continuous' symmetry lead to gapless excitations but not that of a discrete symmetry?
Goldstone theorem, especially in the context of condensed matter physics, can be stated as:
Whenever there is spontaneous breakdown of a continuous global symmetry, the spectrum of the theory ...
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