Counting rule for Nambu-Goldstone modes in nonrelativistic systems [PDF]
Yoshimasa HidakaThe counting rule of Nambu-Goldstone modes is discussed using Mori's projection operator method in nonrelativistic systems. We show the number of the Nambu-Goldstone modes are equal to the number of the broken charges, Q_a, minus half the rank of the expectation value of [Q_a,Q_b], if the corresponding matrix of the decay constant is regular.View original: http://arxiv.org/abs/1203.1494
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