Unified Description of Nambu-Goldstone Bosons without Lorentz Invariance

Abstract

Using the effective Lagrangian approach, we clarify general issues about Nambu-Goldstone bosons without Lorentz invariance. We show how to count their number and study their dispersion relations. Their number is less than the number of broken generators when some of them form canonically conjugate pairs. The pairing occurs when the generators have a nonzero expectation value of their commutator. For non-semi-simple algebras, central extensions are possible. The underlying geometry of the coset space in general is partially symplectic.

5 pages, REVTeX 4.1; v3: published version

References in corpus (2)

• On the number of Nambu-Goldstone bosons and its relation to charge densities
• Spontaneous breaking of continuous translational invariance

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