Results 161 to 170 of about 75,052 (218)

Isotropic Loop Quantum Cosmology with Matter

open access: yes, 2002
A free massless scalar field is coupled to homogeneous and isotropic loop quantum cosmology. The coupled model is investigated in the vicinity of the classical singularity, where discreteness is essential and where the quantum model is non-singular, as ...
A. Ashtekar   +22 more
core   +1 more source

Universal features of quantum bounce in loop quantum cosmology

open access: yesPhysics Letters B, 2017
In this Letter, we study analytically the evolutions of the flat Friedmann–Lemaitre–Robertson–Walker (FLRW) universe and its linear perturbations in the framework of the dressed metric approach in loop quantum cosmology (LQC). Assuming that the evolution
Tao Zhu   +4 more
doaj  

Preinflationary Dynamics of Power-Law Potential in Loop Quantum Cosmology †

open access: yesUniverse, 2018
In this article, I mainly discuss the dynamics of the pre-inflationary Universe for the potential V ( ϕ ) ∝ ϕ n with n = 5 / 3 in the context of loop quantum cosmology, in which the big bang singularity is resolved by a non ...
M. Shahalam
doaj   +1 more source

Adiabatic and non-adiabatic perturbations for loop quantum cosmology

open access: yes, 2011
We generalize the perturbations theory of loop quantum cosmology to a hydrodynamical form and define an effective curvature perturbation on an uniform density hypersurfaces $\zeta_e$. As in the classical cosmology, $\zeta_e$ should be gauge-invariant and
C. Rovell   +6 more
core   +1 more source

Loop Quantum Gravity Vacuum with Nondegenerate Geometry

open access: yesSymmetry, Integrability and Geometry: Methods and Applications, 2012
In loop quantum gravity, states of the gravitational field turn out to be excitations over a vacuum state that is sharply peaked on a degenerate spatial geometry.
Hanno Sahlmann, Tim Koslowski
doaj   +1 more source

Efficiently evaluating loop integrals in the EFTofLSS using QFT integrals with massive propagators

open access: yesJournal of High Energy Physics
We develop a new way to analytically calculate loop integrals in the Effective Field Theory of Large Scale-Structure. Previous available methods show severe limitations beyond the one-loop power spectrum due to analytical challenges and computational and
Charalampos Anastasiou   +3 more
doaj   +1 more source

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