On strong coupling in nonrelativistic general covariant theory of gravity

Jun, 2011
8 pages
Published in:
  • Phys.Rev.D 84 (2011) 044051
e-Print:

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Abstract: (arXiv)
We study the strong coupling problem in the Horava-Melby-Thompson setup of the Horava-Lifshitz gravity with an arbitrary coupling constant λ\lambda, generalized recently by da Silva, where λ\lambda describes the deviation of the theory in the infrared from general relativity that has λGR=1\lambda_{GR} = 1. We find that a scalar field in the Minkowski background becomes strong coupling for processes with energy higher than Λω[(Mpl/c1)3/2Mplλ15/4]\Lambda_{\omega} [\equiv (M_{pl}/c_1)^{3/2} M_{pl}|\lambda - 1|^{5/4}], where generically c1Mplc_1 \ll M_{pl}. However, this problem can be cured by introducing a new energy scale MM_{*}, so that M<ΛωM_{*} < \Lambda_{\omega}, where MM_{*} denotes the suppression energy of high order derivative terms of the theory.
  • 04.60.-m
  • 98.80.Cq
  • 98.80.Bp
  • field theory: scalar
  • gravitation: Horava-Lifshitz
  • gravitation: strong coupling
  • general relativity
  • gravitation: nonrelativistic
  • covariance
  • infrared