Goldstone's Theorem and Hamiltonian of Multi-galileon Modified Gravity
arXiv:1011.0863 · doi:10.1103/PhysRevD.83.064005
Abstract
The galileon model was recently proposed to locally describe a class of modified gravity theories, including the braneworld DGP model. We discuss spontaneous symmetry breaking of the self-accelerating branch in a multi-galileon theory with internal global symmetries. We show a modified version of Goldstone's theorem is applicable to the symmetry breaking pattern and discuss its implications. We also derive the Hamiltonian of a general multi-galileon theory and discuss its implications.
13 pages, 1 figure; To appear in PRD
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