44 citations · 294 across the 18 of their papers we have counts for
15 papers · 1 filter
Radial quantization of the Schwarzschild geometry: relational observables, evaporation, and remnant state
David Brizuela, Leonardo Chataignier, Mikel López-Escondrillas
We consider the canonical quantization of the Schwarzschild geometry in a minisuperspace description based on a foliation with leaves labeled by the radial variable. This formulati…
Origin of time and probability in quantum cosmology
Leonardo Chataignier, Claus Kiefer, Mritunjay Tyagi
We discuss how the classical notions of time and causal structure may emerge together with quantum-mechanical probabilities from a universal quantum state. For this, the process of…
Phase time and Ehrenfest's theorem in relativistic quantum mechanics and quantum gravity
Leonardo Chataignier
We revisit the concept of phase time, which has been previously proposed as a solution to the problem of time in quantum gravity. Concretely, we show how the geometry of configurat…
Time and its arrow from quantum geometrodynamics?
Claus Kiefer, Leonardo Chataignier, Mritunjay Tyagi
We discuss how quantum geometrodynamics, a conservative approach to quantum gravity, might explain the emergence of classical spacetime and, with it, the emergence of classical tim…
Relaxation of first-class constraints and the quantization of gauge theories: from "matter without matter" to the reappearance of time in quantum gravity
Roberto Casadio, Leonardo Chataignier, Alexander Yu. Kamenshchik +3
We make a conceptual overview of a particular approach to the initial-value problem in canonical gauge theories. We stress how the first-class phase-space constraints may be relaxe…
Observations in Quantum Cosmology
Leonardo Chataignier, Claus Kiefer, Paulo Moniz
In this review, we focus on whether a canonical quantization of general relativity can produce testable predictions for cosmology. In particular, we examine how this approach can b…