Counting rule for Nambu-Goldstone modes in nonrelativistic systems
classification
✦ hep-th
cond-mat.otherhep-ph
keywords
modesnambu-goldstonecountingnonrelativisticnumberrulesystemsbroken
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The counting rule for Nambu-Goldstone modes is discussed using Mori's projection operator method in nonrelativistic systems at zero and finite temperatures. We show that the number of Nambu-Goldstone modes is equal to the number of broken charges, Q_a, minus half the rank of the expectation value of [Q_a,Q_b].
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