Hořava gravity at a Lifshitz point: A progress report

Jan 21, 2017
56 pages
Published in:
  • Int.J.Mod.Phys.D 26 (2017) 07, 1730014
  • Published: Mar 16, 2017
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Abstract: (WSP)
Hořava’s quantum gravity at a Lifshitz point is a theory intended to quantize gravity by using traditional quantum field theories. To avoid Ostrogradsky’s ghosts, a problem that has been facing in quantization of general relativity since the middle of 1970’s, Hořava chose to break the Lorentz invariance by a Lifshitz-type of anisotropic scaling between space and time at the ultra-high energy, while recovering (approximately) the invariance at low energies. With the stringent observational constraints and self-consistency, it turns out that this is not an easy task, and various modifications have been proposed, since the first incarnation of the theory in 2009. In this review, we shall provide a progress report on the recent development of Hořava gravity. In particular, we first present four so far most-studied versions of Hořava gravity, by focusing first on their self-consistency and then their consistency with experiments, including the solar system tests and cosmological observations. Then, we provide a general review on the recent development of the theory in three different but also related areas: (i) universal horizons, black holes and their thermodynamics, (ii) nonrelativistic gauge/gravity duality and (iii) quantization of the theory. The studies in these areas can be easily generalized to other gravitational theories with broken Lorentz invariance.
Note:
  • revtex4, three figures. Corrected various typos. Int. J. Mod. Phys. D26 (2017) 1730014
  • 04.60.−m
  • 04.70.−s
  • 97.60.Lf
  • 98.80.−k
  • Quantum gravity
  • universal horizons
  • Hawking radiation
  • nonrelativistic gauge/gravity duality
  • violation: Lorentz
  • gravitation: quantization