title: Phenomenologically viable Lorentz-violating quantum gravity.
abstract: Horava's "Lifschitz point gravity" has many desirable features, but in its original incarnation one is forced to accept a nonzero cosmological constant of the wrong sign to be compatible with observation. We develop an extension of Horava's model that abandons "detailed balance" and regains parity invariance, and in 3+1 dimensions exhibit all five marginal (renormalizable) and four relevant (super-renormalizable) operators, as determined by power counting. We also consider the classical limit of this theory, evaluate the Hamiltonian and supermomentum constraints, and extract the classical equations of motion in a form similar to the Arnowitt-Deser-Misner formulation of general relativity. This puts the model in a framework amenable to developing detailed precision tests.
authors: Center for Fundamental Physics, University of Maryland, College Park, Maryland 20742-4111, USA.
authors: Thomas P
authors: TP
authors: Sotiriou
authors: Matt
authors: M
authors: Visser
authors: Silke
authors: S
authors: Weinfurtner