Phys. Rev. Lett. 88, 101602 (2002) [4 pages]Spontaneously Broken Spacetime Symmetries and Goldstone’s TheoremReceived 1 November 2001; published 25 February 2002 Goldstone’s theorem states that there is a massless mode for each broken symmetry generator. It has been known for a long time that the naive generalization of this counting fails to give the correct number of massless modes for spontaneously broken spacetime symmetries. We explain how to get the right count of massless modes in the general case, and discuss examples involving spontaneously broken Poincaré and conformal invariance. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.101602
DOI:
10.1103/PhysRevLett.88.101602
PACS:
11.30.Qc, 11.27.+d, 11.30.Cp
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