Results 41 to 50 of about 6,202 (230)
Noncommutativity in Effective Loop Quantum Cosmology
Advances in High Energy Physics, 2019 We construct a noncommutative extension of the Loop Quantum Cosmology effective scheme for the flat FLRW model with a free scalar field via a theta deformation.
Abraham Espinoza-García +3 more
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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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Quantum cosmological models [PDF]
Classical and Quantum Gravity, 2005 revised: now includes time asymmetry, black hole final state etc, 71 ...
openaire +4 more sources
Transport properties in the Horndeski holographic two-currents model
European Physical Journal C: Particles and Fields, 2023 The transport features of the holographic two-currents model are investigated in the Horndeski gravity framework. This system displays metallic or insulating characteristics depending on whether the Horndeski coupling parameter $$\gamma $$ γ is negative ...
Dan Zhang +4 more
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Quantum out-of-equilibrium cosmology
European Physical Journal C: Particles and Fields, 2019 In this work, our prime focus is to study the one to one correspondence between the conduction phenomena in electrical wires with impurity and the scattering events responsible for particle production during stochastic inflation and reheating implemented
Sayantan Choudhury +3 more
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On the cosmological constant in quantum cosmology
, 2006 Quantization of a dust-like closed isotropic cosmological model with a cosmological constant is realized by the method of B. DeWitt \cite{1}. It is shown that such quantization leads to interesting results, in particular, to a finite lifetime of the system, and appearance of the Universe in our world as penetration via the barrier. These purely quantum
Kalinin M.I., Melnikov V.N.
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DECOHERENCE IN QUANTUM COSMOLOGY AND THE COSMOLOGICAL CONSTANT [PDF]
Modern Physics Letters A, 2013 We discuss a spacetime having the topology of S3×ℝ but with a different smoothness structure. The initial state of the cosmos in our model is identified with a wildly embedded 3-sphere (or a fractal space). In previous work we showed that a wild embedding is obtained by a quantization of a usual (or tame) embedding.
Jerzy Król, Torsten Asselmeyer-Maluga
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The Finslerian quantum cosmology [PDF]
Canadian Journal of Physics, 2020 We present a Friedmann–Robertson–Walker quantum cosmological model within the framework of Finslerian geometry. In this work, we consider a specific fluid. We obtain the corresponding Wheeler–DeWitt equation as the usual constraint equation as well as the Schrödinger equation following Dirac, although the approaches yield the same time-independent ...
De, S.S., Rahaman, Farook, Paul, Nupur
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Universe, 2022 This Special Issue presents a collection of review and original papers on various aspects and applications of quantum cosmological models [...]
Jean-Pierre Gazeau +1 more
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Cosmology Due to Thermodynamics of Apparent Horizon
Annalen der Physik, EarlyView.Effective cosmological constant as a function of the Hubble rate H for different entropy parameters b. Figure shows the asymptotic of the effective cosmological constant. At H = 0 the effective cosmological constant vanishes. Abstract This study proposes new entropy of the apparent horizon Sh=(1/β)arctan(βSBH)$S_h=(1/\beta)\arctan (\beta S_{BH ...
S. I. Kruglov
wiley +1 more source