New branches of massive gravity

D. Comelli, M. Crisostomi, K. Koyama, L. Pilo, G. Tasinato

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The basic building block for Lorentz-invariant and ghost-free massive gravity is the square root of the combination g−1η, where g−1 is the inverse of the physical metric and η is a reference metric. Since the square root of a matrix is not uniquely defined, it is possible to have physically inequivalent potentials corresponding to different branches. We show that around the Minkowski background, the only perturbatively well-defined branch is the potential proposed by de Rham, Gabadadze and Tolley. On the other hand, if Lorentz symmetry is broken spontaneously, other potentials exist with a standard perturbative expansion. We show this explicitly building new Lorentz-invariant, ghost-free massive gravity potentials for theories that in the background preserve rotational invariance but break Lorentz boosts
Original languageEnglish
Pages (from-to)121502
JournalPhysical Review D
Issue number12
Publication statusPublished - 15 Jun 2015


  • RCUK
  • STFC
  • ST/H005498/1


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