Counting rule for Nambu-Goldstone modes in nonrelativistic systems

Details Counting rule for Nambu-Goldstone modes in nonrelativistic systems Counting rule for Nambu-Goldstone modes in nonrelativistic systems

2012-03-07

arxiv.org/abs/1203.1494v2

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, no figures; references added; typos corrected; some discussion added and clarified

Scientific paper

The counting rule for Nambu-Goldstone modes is discussed using Mori's
projection operator method in nonrelativistic systems. 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], if the corresponding decay
constant matrix is regular.

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