Loop quantum gravity, signature change, and the no-boundary proposal
arXiv:2011.02884 · doi:10.1103/PhysRevD.102.106023
Abstract
Covariant models of loop quantum gravity generically imply dynamical signature change at high density. This article presents detailed derivations that show the fruitful interplay of this new kind of signature change with wave-function proposals of quantum cosmology, such as the no-boundary and tunneling proposals. In particular, instabilities of inhomogeneous perturbations found in a Lorentzian path-integral treatment are naturally cured. Importantly, dynamical signature change does not require Planckian densities when off-shell instantons are relevant.
26 pages, v2: additional references
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Cited by in corpus (11)
- Avoiding singularities in Lorentzian-Euclidean black holes: the role of atemporality
- Dynamical features and shadows of quantum Schwarzschild black hole in effective field theories of gravity
- No-boundary Wave Function, Wheeler-DeWitt Equation and Path Integral Analysis of the Bouncing `Quantum' Cosmology
- Annihilation-to-nothing: DeWitt boundary condition inside a black hole
- Loop quantum cosmology: relation between theory and observations
- No Smooth Spacetime in Lorentzian Quantum Cosmology and Trans-Planckian Physics
- Impact of generalized holonomy corrections on the cosmological primordial power spectra
- The Primordial Particle Accelerator of the Cosmos
- The birth of the Universe as a result of the change of the metric signature
- No smooth spacetime: Exploring primordial perturbations in Lorentzian quantum cosmology
- Wave function of the universe in the presence of trans-Planckian censorship