Results 71 to 80 of about 77,468 (282)
Primordial perturbations in the Dapor-Liegener model of hybrid loop quantum cosmology [PDF]
, 2020 In this work, we extend the formalism of hybrid loop quantum cosmology for primordial perturbations around a flat, homogeneous, and isotropic universe to the new treatment of Friedmann-Lemaitre-Robertson-Walker geometries proposed recently by Dapor and ...
Laura Castelló Gomar +2 more
semanticscholar +1 more source
Loop Quantum Cosmology, Modified Gravity and Extra Dimensions
Universe, 2016 Loop quantum cosmology (LQC) is a framework of quantum cosmology based on the quantization of symmetry reduced models following the quantization techniques of loop quantum gravity (LQG).
Xiangdong Zhang
doaj +1 more source
Homogeneous loop quantum cosmology [PDF]
Classical and Quantum Gravity, 2003 25 pages, 3 ...
openaire +3 more sources
Loop quantum gravity and cosmological constant
Physics Letters B, 2021 A one-parameter regularization freedom of the Hamiltonian constraint for loop quantum gravity is analyzed. The corresponding spatially flat, homogenous and isotropic model includes the two well-known models of loop quantum cosmology as special cases. The
Xiangdong Zhang, Gaoping Long, Yongge Ma
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
core +3 more sources
Emergent de Sitter Epoch of the Quantum Cosmos from Loop Quantum Cosmology. [PDF]
Physical Review Letters, 2018 The quantum nature of the big bang is reexamined in the framework of loop quantum cosmology. The strict application of a regularization procedure to the Hamiltonian, originally developed for the Hamiltonian in loop quantum gravity, leads to a qualitative
Mehdi Assanioussi +3 more
semanticscholar +1 more source
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
Inflationary Cosmology and Quantization Ambiguities in Semi-Classical Loop Quantum Gravity [PDF]
, 2004 In loop quantum gravity, modifications to the geometrical density cause a self-interacting scalar field to accelerate away from a minimum of its potential.
A. Ashtekar +30 more
core +3 more sources
Observational Constraints on Loop Quantum Cosmology
Physical Review Letters, 2011 In the inflationary scenario of loop quantum cosmology in the presence of inverse-volume corrections, we give analytic formulas for the power spectra of scalar and tensor perturbations convenient to compare with observations. Since inverse-volume corrections can provide strong contributions to the running spectral indices, inclusion of terms higher ...
Bojowald, M. +2 more
openaire +5 more sources
Martín-Benito–Mena Marugán–Olmedo prescription for the Dapor-Liegener model of loop quantum cosmology [PDF]
Physical Review D, 2019 Recently, an alternative Hamiltonian constraint for Loop Quantum Cosmology has been put forward by Dapor and Liegener, inspired by previous work on regularization due to Thiemann.
Alejandro Garc'ia-Quismondo +1 more
semanticscholar +1 more source