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Thermodynamics in Loop Quantum Cosmology [PDF]
Advances in High Energy Physics, 2009 Loop quantum cosmology (LQC) is very powerful to deal with the behavior of early universe. Moreover, the effective loop quantum cosmology gives a successful description of the universe in the semiclassical region.
Li-Fang Li, Jian-Yang Zhu
doaj +3 more sources
, 2013 This Chapter provides an up to date, pedagogical review of some of the most relevant advances in loop quantum cosmology. We review the quantization of homogeneous cosmological models, their singularity resolution and the formulation of effective ...
Agullo, Ivan, Corichi, Alejandro
core +7 more sources
Unimodular Loop Quantum Cosmology [PDF]
Physical Review D, 2010 Unimodular gravity is based on a modification of the usual Einstein-Hilbert action that allows one to recover general relativity with a dynamical cosmological constant.
A. Ashtekar +12 more
core +5 more sources
Editorial: Loop Quantum Cosmology
Frontiers in Astronomy and Space Sciences, 2022 3 pags. Editorial on the Research Topic 3 pags. This work was partially supported by Project No. MICINN PID2020-118159GB-C41 from Spain. BE acknowledges financial support from the Standard Program of JSPS Postdoctoral Fellowships for Research in Japan. FV acknowledges financial support from by the Canada Research Chairs Program, the
Beatriz Elizaga Navascués +3 more
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Absence of a Singularity in Loop Quantum Cosmology [PDF]
Physical Review Letters, 2001 It is shown that the cosmological singularity in isotropic minisuperspaces is naturally removed by quantum geometry. Already at the kinematical level, this is indicated by the fact that the inverse scale factor is represented by a bounded operator even though the classical quantity diverges at the initial singularity.
Martin Bojowald
openalex +5 more sources
The perturbed universe in the deformed algebra approach of Loop Quantum Cosmology [PDF]
, 2016 Loop quantum cosmology is a tentative approach to model the universe down to the Planck era where quantum gravity settings are needed. The quantization of the universe as a dynamical space-time is inspired by Loop Quantum Gravity ideas. In addition, loop quantum cosmology could bridge contact with astronomical observations, and thus potentially ...
Grain, J.
arxiv +4 more sources
Isotropic Loop Quantum Cosmology [PDF]
Classical and Quantum Gravity, 2002 Isotropic models in loop quantum cosmology allow explicit calculations, thanks largely to a completely known volume spectrum, which is exploited in order to write down the evolution equation in a discrete internal time.
+25 more
core +7 more sources
On the Physical Hilbert Space of Loop Quantum Cosmology [PDF]
, 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 +9 more
core +2 more sources
The Semiclassical Limit of Loop Quantum Cosmology [PDF]
Class.Quant.Grav.18:L109-L116,2001, 2001 The continuum and semiclassical limits of isotropic, spatially flat loop quantum cosmology are discussed, with an emphasis on the role played by the Barbero-Immirzi parameter \gamma in controlling space-time discreteness. In this way, standard quantum cosmology is shown to be the simultaneous limit \gamma \to 0, j \to \infty of loop quantum cosmology ...
Ashtekar A +20 more
arxiv +5 more sources
Generic absence of strong singularities and geodesic completeness in modified loop quantum cosmologies [PDF]
Class.Quant.Grav. 36 (2019) 105014, 2018 Different regularizations of the Hamiltonian constraint in loop quantum cosmology yield modified loop quantum cosmologies, namely mLQC-I and mLQC-II, which lead to qualitatively different Planck scale physics. We perform a comprehensive analysis of resolution of various singularities in these modified loop cosmologies using effective spacetime ...
Saini, Sahil, Singh, Parampreet
arxiv +5 more sources