Results 61 to 70 of about 75,052 (218)
Hybrid models in loop quantum cosmology [PDF]
International Journal of Modern Physics D, 2016 In the framework of Loop Quantum Cosmology (LQC), inhomogeneous models are usually quantized by means of a hybrid approach that combines loop quantization techniques with standard quantum field theory methods. This approach is based on a splitting of the phase space in a homogeneous sector, formed by global, zero-modes and an inhomogeneous sector ...
Navascues, B.E. +3 more
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Classical and loop quantum cosmology phase space of interacting dark energy and superfluid dark matter [PDF]
Physical Review D, 2019 In this paper we study in detail the phase space of a cosmological system consisting of two coupled fluids, namely a dark energy fluid coupled with a superfluid dark matter fluid.
V. Oikonomou
semanticscholar +1 more source
Generic absence of strong singularities and geodesic completeness in modified loop quantum cosmologies [PDF]
, 2019 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.
Saini, Sahil, Singh, Parampreet
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Quantum cosmology of (loop) quantum gravity condensates: an example [PDF]
, 2014 Spatially homogeneous universes can be described in (loop) quantum gravity as condensates of elementary excitations of space. Their treatment is easiest in the second-quantized group field theory formalism, which allows the adaptation of techniques from ...
Steffen Gielen
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Non-bouncing solutions in loop quantum cosmology [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 According to the Belinskii-Khalatnikov-Lifshitz scenario, a collapsing universe approaching a spacelike singularity can be approximated by homogeneous cosmological dynamics, but only if asymptotically small spatial regions are considered.
M. Bojowald
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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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Equivalence of Models in Loop Quantum Cosmology and Group Field Theory
Universe, 2019 The paradigmatic models often used to highlight cosmological features of loop quantum gravity and group field theory are shown to be equivalent, in the sense that they are different realizations of the same model given by harmonic cosmology.
Bekir Baytaş +2 more
doaj +1 more source
Loop cosmological dynamics and dualities with Randall-Sundrum braneworlds [PDF]
, 2006 The discrete quantum geometric effects play an important role in dynamical evolution in the loop quantum cosmology. These effects which are significant at the high energies lead to the quadratic energy density modifications to the Friedmann equation, as ...
A. Ashtekar +6 more
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Superinflation in loop quantum cosmology [PDF]
Physical Review D, 2008 11 pages, 2 figures.
Edmund J. Copeland +3 more
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Some physical implications of regularization ambiguities in SU(2) gauge-invariant loop quantum cosmology [PDF]
Physical Review D, 2019 The way physics of loop quantum gravity is affected by the underlying quantization ambiguities is an open question. We address this issue in the context of loop quantum cosmology using gauge-covariant fluxes.
K. Liegener, Parampreet Singh
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