Results 11 to 20 of about 1,577,801 (299)
Zeitschrift für Naturforschung A, 2008 We give an introduction into quantum cosmology with emphasis on its conceptual parts. After a general motivation we review the formalism of canonical quantum gravity on which discussions of quantum cosmology are usually based.
Kiefer, Claus, Sandhoefer, Barbara
core +3 more sources
Quantum String Cosmology [PDF]
Universe, 2021 We present a short review of possible applications of the Wheeler-De Witt equation to cosmological models based on the low-energy string effective action, and characterised by an initial regime of asymptotically flat, low energy, weak coupling evolution.
Maurizio Gasperini
doaj +4 more sources
Lorentzian quantum cosmology [PDF]
Physical Review D, 2017 We argue that the Lorentzian path integral is a better starting point for quantum cosmology than its Euclidean counterpart. In particular, we revisit the minisuperspace calculation of the Feynman path integral for quantum gravity with a positive ...
Job Leon Feldbrugge +2 more
semanticscholar +6 more sources
Time in Quantum Cosmology [PDF]
Universe, 2022 Time in quantum gravity is not a well-defined notion despite its central role in the very definition of dynamics. Using the formalism of quantum geometrodynamics, we briefly review the problem and illustrate it with two proposed solutions.
Claus Kiefer, Patrick Peter
doaj +3 more sources
Quantum Effects In Cosmology [PDF]
Classical and Quantum Gravity, 1993 Contents: Introduction. The Present State of the Universe. What Can We Expect From a Complete Cosmological Theory? An Overview of Quantum Effects in Cosmology. Parametric (Superadiabatic) Amplification of Classical Waves.
Belinsky V A +38 more
core +4 more sources
Quantum cosmology: a review [PDF]
Reports on Progress in Physics, 2015 In quantum cosmology, one applies quantum physics to the whole universe. While no unique version and no completely well-defined theory is available yet, the framework gives rise to interesting conceptual, mathematical and physical questions.
M. Bojowald
semanticscholar +5 more sources
Noncommutative Quantum Cosmology [PDF]
General Relativity and Gravitation, 2004 We consider noncommutative quantum cosmology in the case of the low-energy string effective theory. Exacts solutions are found and compared with the commutative case.The Noncommutative quantum cosmology is considered in the case of the low-energy string ...
A. Connes +12 more
core +3 more sources
QUANTUM COSMOLOGIES AND THE “BEGINNING”
Zygon, 1991 . The cosmology proposed by Stephen Hawking has been understood as support for an atheistic stance, due mainly to its view of the nature of time in combination with the absence of explicit boundary conditions.
doaj +5 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 ...
I. Agulló +2 more
semanticscholar +1 more source
Big bang singularity resolution in quantum cosmology [PDF]
Classical and quantum gravity, 2022 We evaluate the physical viability and logical strength of an array of putative criteria for big bang singularity resolution in quantum cosmology. Based on this analysis, we propose a mutually consistent set of constitutive conditions, which we argue ...
K. Thébault
semanticscholar +1 more source