Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-05-18
JHEP 0910:033,2009
Physics
High Energy Physics
High Energy Physics - Theory
36 pages. V2: three references added, technical changes to gauge-fixing discussion, minor edits. V3: some additional discussio
Scientific paper
There has been a significant surge of interest in Horava's model for 3+1 dimensional quantum gravity, this model being based on anisotropic scaling at a z=3 Lifshitz point. Horava's model, and its variants, show dramatically improved ultra-violet behaviour at the cost of exhibiting violation of Lorentz invariance at ultra-high momenta. Following up on our earlier note, [arXiv:0904.4464 [hep-th]], we discuss in more detail our variant of Horava's model. In contrast to Horava's original model, we abandon "detailed balance" and restore parity invariance. We retain, however, Horava's "projectability condition" and explore its implications. Under these conditions, we explicitly exhibit the most general model, and extract the full classical equations of motion in ADM form. We analyze both spin-2 and spin-0 graviton propagators around flat Minkowski space. We furthermore analyze the classical evolution of FLRW cosmologies in this model, demonstrating that the higher-derivative spatial curvature terms can be used to mimic radiation fluid and stiff matter. We conclude with some observations concerning future prospects.
Sotiriou Thomas P.
Visser Matt
Weinfurtner Silke
No associations
LandOfFree
Quantum gravity without Lorentz invariance does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Quantum gravity without Lorentz invariance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum gravity without Lorentz invariance will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-609167