Results 91 to 100 of about 39,130 (174)

Properties of Fluctuating States in Loop Quantum Cosmology

Mathematics, 2019
In loop quantum cosmology, the values of volume fluctuations and correlations determine whether the dynamics of an evolving state exhibits a bounce. Of particular interest are states that are supported only on either the positive or the negative part of ...
Martin Bojowald
doaj   +1 more source

On the Physical Hilbert Space of Loop Quantum Cosmology

, 2004
In this paper we present a model of Riemannian loop quantum cosmology with a self-adjoint quantum scalar constraint. The physical Hilbert space is constructed using refined algebraic quantization.
A. Ashtekar, Abhay Ashtekar, Abhay Ashtekar, Alejandro Perez, C. Rovelli, C. Rovelli, Karim Noui, Kevin Vandersloot, L. Smolin, Martin Bojowald   +9 more
core   +1 more source

Editorial: Loop Quantum Cosmology

Frontiers in Astronomy and Space Sciences, 2022
Beatriz Elizaga Navascués, Guillermo A. Mena Marugán, Francesca Vidotto, Francesca Vidotto   +3 more
doaj   +1 more source

Gravitational wave generation in loop quantum cosmology

, 2011
We calculate the full spectrum, as observed today, of the cosmological gravitational waves generated within a model based on loop quantum cosmology. It is assumed that the universe, after the transition to the classical regime, undergoes a period of ...
A. A. Starobinskii, Alfredo B. Henriques, B. Allen, C. Rovelli, L. P. Grishchuk, M. Bojowald, M. Bojowald, Paulo M. Sá   +7 more
core   +1 more source

A Status Report on the Phenomenology of Black Holes in Loop Quantum Gravity: Evaporation, Tunneling to White Holes, Dark Matter and Gravitational Waves

Universe, 2018
The understanding of black holes in loop quantum gravity is becoming increasingly accurate. This review focuses on the possible experimental or observational consequences of the underlying spinfoam structure of space-time.
Aurélien Barrau, Killian Martineau, Flora Moulin   +2 more
doaj   +1 more source

Uniqueness of measures in loop quantum cosmology [PDF]

Journal of Mathematical Physics, 2015
In Ashtekar and Campiglia [Classical Quantum Gravity 29, 242001 (2012)], residual diffeomorphisms have been used to single out the standard representation of the reduced holonomy-flux algebra in homogeneous loop quantum cosmology (LQC). We show that, in the homogeneous isotropic case, unitarity of the translations with respect to the extended ℝ-action (
openaire   +2 more sources

A novel link between Wheeler-DeWitt quantization and (effective) loop quantum cosmology

Physics Letters B
It is shown that several prescriptions for the effective continuum limit of the flat Friedmann-Lemaitre-Robertson-Walker loop quantum cosmology can be understood as the exact classical limit of the Wheeler-DeWitt quantization of certain dynamical systems,
Abraham Espinoza-García
doaj   +1 more source

Switching Internal Times and a New Perspective on the `Wave Function of the Universe’

Universe, 2019
Despite its importance in general relativity, a quantum notion of general covariance has not yet been established in quantum gravity and cosmology, where, given the a priori absence of coordinates, it is necessary to replace classical frames with ...
Philipp A. Höhn
doaj   +1 more source

Perturbations in Hybrid Loop Quantum Cosmology: Continuum Limit in Fourier Space

, 2018
We analyze the passage to a continuum limit of the mode spectrum of primordial perturbations around flat cosmological spacetimes in hybrid Loop Quantum Cosmology, showing that this limit can be reached even if one starts by considering a finite fiducial ...
Marugán, Guillermo A. Mena, Navascués, Beatriz Elizaga   +1 more
core   +1 more source

General covariant transition amplitudes in quantum cosmology

, 2011
The path-integral approach to cosmology consists in the computation of transition amplitudes between states of the quantum geometry of the universe.
Vidotto, Francesca
core   +1 more source