Results 61 to 70 of about 77,468 (282)
Universe, 2022 The hybrid and the dressed metric formalisms for the study of primordial perturbations in Loop Quantum Cosmology lead to dynamical equations for the modes of these perturbations that are of a generalized harmonic-oscillator type, with a mass that depends
Simon Iteanu, Guillermo A. Mena Marugán
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Quasi-probability distributions in loop quantum cosmology [PDF]
Classical and quantum gravity, 2020 In this paper, we introduce a complete family of parametrized quasi-probability distributions in phase space and their corresponding Weyl quantization maps with the aim to generalize the recently developed Wigner–Weyl formalism within the loop quantum ...
J. Berra-Montiel, Alberto Molgado
semanticscholar +1 more source
Loop quantum cosmology: an overview [PDF]
General Relativity and Gravitation, 2009 A brief overview of loop quantum cosmology of homogeneous isotropic models is presented with emphasis on the origin of and subtleties associated with the resolution of big bang and big crunch singularities. These results bear out the remarkable intuition that John Wheeler had. Discussion is organized at two levels.
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On the holographic basis of loop quantum cosmology
European Physical Journal C: Particles and Fields, 2018 In this work, we obtain the loop quantum cosmology dynamical equations, plus a positive cosmological constant, from the Bekenstein–Hawking entropy-area relation given by Loop Quantum Black Holes, by the use of the Jacobson formalism (Phys Rev Lett 75 ...
C. A. S. Silva
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An Overview on the Nature of the Bounce in LQC and PQM
Universe, 2021 We present a review on some of the basic aspects concerning quantum cosmology in the presence of cut-off physics as it has emerged in the literature during the last fifteen years.
Gabriele Barca +2 more
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Superinflation in loop quantum cosmology [PDF]
Physical Review D, 2008 11 pages, 2 figures.
Copeland, E. J. +3 more
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Gauge-Invariant Perturbations at a Quantum Gravity Bounce
Universe, 2022 We study the dynamics of gauge-invariant scalar perturbations in cosmological scenarios with a modified Friedmann equation, such as quantum gravity bouncing cosmologies.
Steffen Gielen, Lisa Mickel
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Warm bounce in loop quantum cosmology and the prediction for the duration of inflation [PDF]
, 2020 We study and estimate probabilistic predictions for the duration of the preinflationary and slow-roll phases after the bounce in loop quantum cosmology, determining how the presence of radiation in the prebounce phase affects these results.
L. Barboza, L. Graef, R. O. Ramos
semanticscholar +1 more source
Consistent loop quantum cosmology [PDF]
Classical and Quantum Gravity, 2009 A consistent combination of quantum geometry effects rules out a large class of models of loop quantum cosmology and their critical densities as they have been used in the recent literature. In particular, the critical density at which an isotropic universe filled with a free, massless scalar field would bounce must be well below the Planck density. In
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Cosmological Footprints of Loop Quantum Gravity [PDF]
Physical Review Letters, 2009 Accepted by Phys. Rev.
Grain, J., Barrau, A.
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