Results 81 to 90 of about 1,650,218 (153)

A novel link between Wheeler-DeWitt quantization and (effective) loop quantum cosmology

Physics Letters B
It is shown that several prescriptions for the effective continuum limit of the flat Friedmann-Lemaitre-Robertson-Walker loop quantum cosmology can be understood as the exact classical limit of the Wheeler-DeWitt quantization of certain dynamical systems,
Abraham Espinoza-García
doaj   +1 more source

Switching Internal Times and a New Perspective on the `Wave Function of the Universe’

Universe, 2019
Despite its importance in general relativity, a quantum notion of general covariance has not yet been established in quantum gravity and cosmology, where, given the a priori absence of coordinates, it is necessary to replace classical frames with ...
Philipp A. Höhn
doaj   +1 more source

Spacetime and the Philosophical Challenge of Quantum Gravity [PDF]

, 2001
We survey some philosophical aspects of the search for a quantum theory of gravity, emphasising how quantum gravity throws into doubt the treatment of spacetime common to the two `ingredient theories' (quantum theory and general relativity), as a 4 ...
Butterfield, Jeremy, Jeremy Butterfield, Christopher Isham, Isham, Chris   +3 more
core   +1 more source

Loop Quantum Gravity Phenomenology: Linking Loops to Observational Physics

Symmetry, Integrability and Geometry: Methods and Applications, 2012
Research during the last decade demonstrates that effects originating on the Planck scale are currently being tested in multiple observational contexts.
Florian Girelli, Franz Hinterleitner, Seth A. Major   +2 more
doaj   +1 more source

Weyl's principle, cosmic time and quantum fundamentalism [PDF]

, 2010
We examine the necessary physical underpinnings for setting up the cosmological standard model with a global cosmic time parameter. In particular, we discuss the role of Weyl's principle which asserts that cosmic matter moves according to certain ...
Zinkernagel, Henrik, Rugh, Svend E.
core  

88th Annual Meeting of the Meteoritical Society 2026: Abstracts

Meteoritics &Planetary Science, Volume 61, Issue S1, Page S48-S551, August 2026.
wiley   +1 more source

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

Journal 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, Diogo P. L. Bragança, Leonardo Senatore, Henry Zheng   +3 more
doaj   +1 more source

Loop Quantum Gravity Vacuum with Nondegenerate Geometry

Symmetry, 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

On the Origin of Time and the Universe: A Modern Reappraisal through Quantum Cosmology, the Kalam Argument and Contemporary Scholarship

MetaScientia: Journal of the History and Philosophy of Science
This article reconsiders the origin of the universe by bringing quantum cosmology, the Kalam Cosmological Argument, and Islamic philosophical theology into dialogue while distinguishing more sharply between scientific description, philosophical ...
Sameer Al-Khawaja
doaj   +1 more source

Why the Big Bang Singularity does not Help the Kalam Cosmological Argument for Theism [PDF]

, 2007
The Big Bang singularity provides little or no evidence for creation in the finite past and hence for theism. Whether one dismisses singularities or takes them seriously, physics licenses no first moment of (space-)time.
Pitts, J. Brian
core