Quantization of 2D Ho\v{r}ava gravity: non-projectable case

TL;DR

This paper quantizes 2D non-projectable Hořava gravity, analyzes its Hamiltonian structure, derives Wheeler-DeWitt equations, and finds classical solutions where spacetime features are encoded in the wavefunction's phase.

Contribution

It provides a Hamiltonian analysis and quantization of non-projectable 2D Hořava gravity, revealing the structure of constraints and classical solutions.

Findings

Two first-class and two second-class constraints identified.

Unique plane-wave solution for the wavefunction obtained.

Classical spacetime features encoded in wavefunction phase.

Abstract

The quantization of two-dimensional Ho\v{r}ava theory of gravity without the projectability condition is considered. Our study of the Hamiltonian structure of the theory shows that there are two first-class and two second-class constraints. Then, following Dirac we quantize the theory by first requiring that the two second-class constraints be strongly equal to zero. This is carried out by replacing the Poisson bracket by the Dirac bracket. The two first-class constraints give rise to the Wheeler-DeWitt equations, which yield uniquely a plane-wave solution for the wavefunction. We also study the classical solutions of the theory and find that the characteristics of classical spacetimes are encoded solely in the phase of the plane-wave solution in terms of the extrinsic curvature of the foliations $t =$Constant, where $t$ denotes the globally-defined time of the theory.