Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2011-12-14
Phys. Rev. D 85, 064003 (2012)
Physics
High Energy Physics
High Energy Physics - Theory
v1: 9 pages; v2: typos corrected, minor rephrasings, published version
Scientific paper
10.1103/PhysRevD.85.064003
We attempt a critical reconsideration of "detailed balance" as a principle that can be used to restrict the proliferation of couplings in Horava-Lifshitz gravity. We re-examine the shortcomings that have been usually associated with it in the literature and we argue that easy remedies can be found for all of them within the framework of detailed balance, and that the most persistent of them are actually related to projectability. We show that, once projectability is abandoned, detailed balance reduces the number of independent couplings by roughly an order of magnitude and imposes only one restriction that constitutes a phenomenological concern: the size of the (bare) cosmological constant is unacceptably large. Remarkably, this restriction (which is present in the projectable version as well) has been so far under-appreciated in the literature. Optimists might prefer to interpret it as a potential blessing in disguise, as it allows one to entertain the idea of a miraculous cancelation between the bare cosmological constant and the (still poorly understood) vacuum energy contribution.
Sotiriou Thomas P.
Vernieri Daniele
No associations
LandOfFree
Horava-Lifshitz gravity: detailed balance revisited 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 Horava-Lifshitz gravity: detailed balance revisited, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Horava-Lifshitz gravity: detailed balance revisited will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-561520