DeWitt boundary condition is consistent in Hořava-Lifshitz quantum gravity
arXiv:2111.00665 · doi:10.1016/j.physletb.2022.137340
Abstract
In quantum cosmology the DeWitt boundary condition is a proposal to set the wave function of the universe to vanish at the classical big-bang singularity. In this Letter, we show that in many gravitational theories including general relativity, the DeWitt wave function does not take a desired form once tensor perturbations around a homogeneous and isotropic closed universe are taken into account: anisotropies and inhomogeneities due to the perturbations are not suppressed near the classical singularity. We then show that Hořava-Lifshitz gravity provides a satisfactory DeWitt wave function. In particular, in the limit of anisotropic scaling, we find an exact analytic expression for the DeWitt wave function of the universe with scale-invariant perturbations. In general cases with relevant deformations, we show that the DeWitt wave function can be systematically expanded around the classical big-bang singularity with perturbations under control.
arXiv comment7 pages, v2: final published version
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- Hartle-Hawking No-boundary Proposal and Hořava-Lifshitz Gravity
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- No smooth spacetime: Exploring primordial perturbations in Lorentzian quantum cosmology
- Dissipative Emergence of Inflation from Quasi-Cyclic Universe
- HBT Interferometry and Quantum Nature of Primordial Gravitational Waves in Hořava-Lifshitz Gravity
- Imprints of the operator ordering ambiguity on the dynamics of perfect fluid dominated quantum universe