Results 111 to 120 of about 2,307 (223)

Further results on geometric operators in quantum gravity

, 1996
We investigate some properties of geometric operators in canonical quantum gravity in the connection approach `a la Ashtekar, which are associated with volume, area and length of spatial regions.
Loll, Renate, Loll, R.
core   +1 more source

A conceptual analysis of Julian Barbour's time [PDF]

, 2011
One of Julian Barbourâ s main aims is to solve the problem of time that appears in quantum geometrodynamics (QG). QG involves the application of canonical quantization procedure to the Hamiltonian formulation of General Relativity.
Kon, Maria
core  

Does gravity induce wavefunction collapse? An examination of Penrose's conjecture [PDF]

, 2013
According to Penrose, the fundamental conflict between the superposition principle of quantum mechanics and the principle of general covariance of general relativity entails the existence of wavefunction collapse, e.g.
Gao, Shan, Shan Gao
core  

Symplectic Structure of Intrinsic Time Gravity

Universe, 2016
The Poisson structure of intrinsic time gravity is analysed. With the starting point comprising a unimodular three-metric with traceless momentum, a trace-induced anomaly results upon quantization.
Eyo Eyo Ita, Amos S. Kubeka
doaj   +1 more source

Do Quantum Objects Have Temporal Parts? [PDF]

, 2012
This paper provides a new context for an established metaphysical debate regarding the problem of persistence. I contend that perdurance (the claim that objects persist by having temporal parts) can be precisely formulated in quantum mechanics due to an
Pashby, Thomas, Thomas Pashby
core  

Asymptotic safety and canonical quantum gravity

International Journal of Modern Physics A
In the context of gravity the Lagrangian and Hamiltonian formalisms have been developed largely independently, emphasizing renormalization and quantization, respectively. The formalisms use a different methodology to distinguish between gauge and physical degrees of freedom.
openaire   +2 more sources

Tunnelling to holographic traversable wormholes

SciPost Physics
We study nonperturbative effects of quantum gravity in a system consisting of a coupled pair of holographic CFTs. The AdS$_4$/CFT$_3$ system has three possible ground states: two copies of empty AdS, a pair of extremal AdS black holes, and an eternal AdS
Suzanne Bintanja, Ben Freivogel, Andrew Rolph
doaj   +1 more source

Change in Hamiltonian General Relativity from the Lack of a Time-like Killing Vector Field [PDF]

, 2013
In General Relativity in Hamiltonian form, change has seemed to be missing, defined only asymptotically, or otherwise obscured at best, because the Hamiltonian is a sum of first-class constraints and a boundary term and thus supposedly generates gauge ...
Pitts, J. Brian, J. Brian Pitts
core  

The dynamics of cosmological scenarios inspired by quantum gravity

, 2006
PhDIn this thesis we study the dynamics of cosmological scenarios inspired by quantum gravity. Part I investigates novel features of the semi-classical regime of homogeneous and isotropic loop quantum cosmology.
Mulryne, David James
core  

From Timeless Physical Theories to Timelessness

Humana.Mente: Journal of Philosophical Studies, 2018
This paper addresses the extent to which both Julian Barbour‘s Machian formulation of general relativity and his interpretation of canonical quantum gravity can be called timeless. We differentiate two types of timelessness in Barbour‘s (1994a, 1994b and
Samuel Baron, Peter Evans, Kristie Miller   +2 more
doaj