Results 1 to 10 of about 614,125 (223)
Testing loop quantum cosmology [PDF]
Comptes Rendus Physique 18 (2017) 207-225, 2016 Loop quantum cosmology predicts that quantum gravity effects resolve the big-bang singularity and replace it by a cosmic bounce. Furthermore, loop quantum cosmology can also modify the form of primordial cosmological perturbations, for example by reducing power at large scales in inflationary models or by suppressing the tensor-to-scalar ratio in the ...
Wilson-Ewing, Edward
arxiv +8 more sources
Homogeneous Loop Quantum Cosmology [PDF]
Classical and Quantum Gravity, 2003 Loop quantum cosmological methods are extended to homogeneous models in diagonalized form. It is shown that the diagonalization leads to a simplification of the volume operator such that its spectrum can be determined explicitly.
Ashtekar A +19 more
core +7 more sources
Higher dimensional Loop Quantum Cosmology [PDF]
Eur. Phys. J. C (2016) 76: 395, 2015 Loop quantum cosmology(LQC) is the symmetric model of loop quantum gravity. In this paper, we generalize the structure of loop quantum cosmology to the theories with arbitrary spacetime dimensions. The isotropic and homogenous cosmological model in n+1 dimensions is quantized by the loop quantization method.
Zhang, Xiangdong
arxiv +7 more sources
Loop quantum cosmology: relation between theory and observations [PDF]
, 2023 This chapter provides a review of the frameworks developed for cosmological perturbation theory in loop quantum cosmology, and applications to various models of the early universe including inflation, ekpyrosis and the matter bounce, with an emphasis on potential observational consequences.
I. Agulló +2 more
arxiv +3 more sources
Living Rev Relativ, 2008 Quantum gravity is expected to be necessary in order to understand situations where classical general relativity breaks down. In particular in cosmology one has to deal with initial singularities, i.e. the fact that the backward evolution of a classical space-time inevitably comes to an end after a finite amount of proper time.
Bojowald M.
europepmc +14 more sources
Loop quantum cosmology and singularities. [PDF]
Sci Rep, 2017 AbstractLoop quantum gravity is believed to eliminate singularities such as the big bang and big crunch singularity. This belief is based on studies of so-called loop quantum cosmology which concerns symmetry-reduced models of quantum gravity. In this paper, the problem of singularities is analysed in the context of the Bohmian formulation of loop ...
Struyve W.
europepmc +8 more sources
Comments on the kinematical structure of loop quantum cosmology [PDF]
Class.Quant.Grav. 21 (2004) L109, 2004 We comment on the presence of spurious observables and on a subtle violation of irreducibility in loop quantum cosmology.
José M. Velhinho
arxiv +3 more sources
Dynamical behavior of interacting dark energy in loop quantum cosmology [PDF]
Int.J.Mod.Phys.A25:4993-5007,2010, 2010 The dynamical behaviors of interacting dark energy in loop quantum cosmology are discussed in this paper. Based on defining three dimensionless variables, we simplify the equations of the fixed points. The fixed points for interacting dark energy can be determined by the Friedmann equation coupled with the dynamical equations {in Einstein cosmology ...
Chen X.-M. +5 more
arxiv +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