Results 201 to 210 of about 6,202 (230)
Some of the next articles are maybe not open access.
2007
Abstract This chapter presents the application of quantum gravity to the Universe as a whole. The concept of minisuperspace is introduced and discussed. Various solutions of the Wheeler-DeWitt equation are found and discussed. Structure formation is discussed as well as boundary conditions and singularity avoidance.
openaire +1 more source
Abstract This chapter presents the application of quantum gravity to the Universe as a whole. The concept of minisuperspace is introduced and discussed. Various solutions of the Wheeler-DeWitt equation are found and discussed. Structure formation is discussed as well as boundary conditions and singularity avoidance.
openaire +1 more source
SUPERSYMMETRIC QUANTUM COSMOLOGY
International Journal of Modern Physics A, 1993Supersymmetric minisuperspace quantization is studied for cosmological models without interaction (Bianchi type I) and for models with interaction like Bianchi type IX, the Taub and the FRW (k=+1) model. In particular for the last two cases the profound differences with standard quantum cosmology are emphasized.
José Socorro +4 more
openaire +3 more sources
Physical Review D, 1987
This paper considers the extension of the ideas of quantum cosmology and, in particular, the proposal of Hartle and Hawking for the boundary conditions of the Universe, to models which incorporate fermions in a realistic manner. We consider inhomogeneous fermionic perturbations about a homogeneous, isotropic minisuperspace background model, by ...
J. J. Halliwell, P. D. D’Eath
openaire +3 more sources
This paper considers the extension of the ideas of quantum cosmology and, in particular, the proposal of Hartle and Hawking for the boundary conditions of the Universe, to models which incorporate fermions in a realistic manner. We consider inhomogeneous fermionic perturbations about a homogeneous, isotropic minisuperspace background model, by ...
J. J. Halliwell, P. D. D’Eath
openaire +3 more sources
Inflation and quantum cosmology
Physica Scripta, 1990Contents: 1. Introduction; 2. Chaotic inflation; 3. Self-reproducing inflationary universe; 4. Adjusting to the new paradigm: absence of cosmological constraints on the axion mass in the inflationary cosmology; 5. Inflation and the wave function of the universe; 6. Chaotic inflation versus extended inflation; 7. Stochastic approach to the baby universe
openaire +2 more sources
Annalen der Physik, 2001
AbstractDifferent models of quantum string minisuperspaces for both isotropic and anisotropic geometries are presented. As for the isotropic case the general model of axion‐dilaton cosmology of arbitrary curvature is studied and solved explicitly. In the anisotropic case Bianchi type I and IX and Kantowski‐Sachs geometries are investigated.
openaire +3 more sources
AbstractDifferent models of quantum string minisuperspaces for both isotropic and anisotropic geometries are presented. As for the isotropic case the general model of axion‐dilaton cosmology of arbitrary curvature is studied and solved explicitly. In the anisotropic case Bianchi type I and IX and Kantowski‐Sachs geometries are investigated.
openaire +3 more sources
Quantum cosmology with electromagnetism
Physical Review D, 1988We investigate the semiclassical quantum cosmology of the spatially homogeneous k = +1 Friedmann-Robertson-Walker minisuperspace model with the electromagnetic field included as a small perturbation on the gravitational background. The wave function is chosen adopting the Hartle-Hawking proposal. Owing to conformal invariance, the electromagnetic field
openaire +3 more sources
Decoherence in quantum cosmology
Physical Review D, 1989We discuss the manner in which the gravitational field becomes classical in quantum cosmology. This involves two steps. First, one must show that the quantum state of the gravitational field becomes strongly peaked about a set of classical configurations.
openaire +3 more sources
Physical Review, 1969
Summary: The Hamiltonian methods of Arnowitt, Deser, and Misner can be applied to homogeneous cosmological models, and prove to be an efficient way both of constructing the Einstein equations and of studying their solutions. By using an appropriate form for the metric, one finds that the constraint equations for these models can be solved explicitly ...
openaire +2 more sources
Summary: The Hamiltonian methods of Arnowitt, Deser, and Misner can be applied to homogeneous cosmological models, and prove to be an efficient way both of constructing the Einstein equations and of studying their solutions. By using an appropriate form for the metric, one finds that the constraint equations for these models can be solved explicitly ...
openaire +2 more sources
Quantum guidelines for solid-state spin defects
Nature Reviews Materials, 2021Gary Wolfowicz +2 more
exaly