On power-counting renormalizability of Hořava gravity with detailed balance

Daniele Vernieri (1)

1 IAP - Institut d'Astrophysique de Paris

We consider the version of Hořava gravity where "detailed balance" is consistently implemented, so as to limit the huge proliferation of couplings in the full theory and obtain healthy dynamics at low energy. Since a superpotential which is third-order in spatial derivatives is not sufficient to guarantee the power-counting renormalizability of the spin-0 graviton, one needs to go an order beyond in derivatives, building a superpotential up to fourth-order spatial derivatives. Here we perturb the action to quadratic order around flat space and show that the power-counting renormalizability of the spin-0 graviton is achieved only by setting to zero a specific coupling of the theory, while the spin-2 graviton is always power-counting renormalizable for any choice of the couplings. This result raises serious doubts about the use of detailed balance.

Keywords: 04.60.-m; 04.50.Kd; 11.30.Cp; Quantum gravity; Modified theories of gravity; Lorentz and Poincare invariance; High Energy Physics - Theory; General Relativity and Quantum Cosmology

Domains: Sciences of the Universe [physics]

Daniele Vernieri. On power-counting renormalizability of Hořava gravity with detailed balance. Physical Review D, 2015, 91, ⟨10.1103/PhysRevD.91.124029⟩. ⟨insu-03644910⟩