Results 121 to 130 of about 2,307 (223)

Emergent Time and Time Travel in Quantum Physics

Universe
Entertaining the possibility of time travel will invariably challenge dearly-held concepts in fundamental physics. It becomes relatively easy to construct multiple logical contradictions using differing starting points from various well-established ...
Ana Alonso-Serrano, Sebastian Schuster, Matt Visser   +2 more
doaj   +1 more source

What Price Determinism? The Hole Story! [PDF]

, 2005
In their modern classic ``What Price Substantivalism? The Hole Story'' Earman and Norton argued that substantivalism about spacetime points implies that general relativity is indeterministic and, for that reason, must be rejected as a candidate ontology ...
Rickles, Dean
core  

State sum models for quantum gravity [PDF]

, 2000
This paper reviews the construction of quantum field theory on a 4-dimensional spacetime by combinatorial methods, and discusses the recent developments in the direction of a combinatorial construction of quantum ...
Barrett, John W.
core  

Publication Only

HemaSphere, Volume 10, Issue S1, June 2026.
wiley   +1 more source

Time evolution in canonical quantum gravity is trivial

Annals of Physics
The Wheeler-DeWitt (WdW) equation does not describe any explicit time evolution of the wave function, and somehow related to this issue, there is no natural way of defining an invariant inner product that provides a viable probability interpretation.
openaire   +2 more sources

Developments in noncommutative differential geometry [PDF]

, 2002
One of the great outstanding problems of theoretical physics is the quantisation of gravity, and an associated description of quantum spacetime. It is often argued that, at short distances, the manifold structure of spacetime breaks down and is replaced ...
Hale, Mark
core  

Classical and quantum cosmology of f(R) gravity’s rainbow in Schutz’s formalism

European Physical Journal C: Particles and Fields
We investigate the classical and quantum dynamics of f(R) gravity’s rainbow in the presence of a perfect fluid, employing Schutz’s formalism to establish a well-defined notion of time. In the classical regime, we derive and solve the equations of motion,
Andrés Burton-Villalobos, Giovanni Otalora, Manuel Gonzalez-Espinoza, Yoelsy Leyva   +3 more
doaj   +1 more source

Statistical Thermodynamics of Polymer Quantum Systems

Symmetry, Integrability and Geometry: Methods and Applications, 2011
Polymer quantum systems are mechanical models quantized similarly as loop quantum gravity. It is actually in quantizing gravity that the polymer term holds proper as the quantum geometry excitations yield a reminiscent of a polymer material.
Guillermo Chacón-Acosta, Elisa Manrique, Leonardo Dagdug, Hugo A. Morales-Técotl   +3 more
doaj   +1 more source

Are Rindler Quanta Real? Inequivalent Particle Concepts in Quantum Field Theory [PDF]

, 2000
Philosophical reflection on quantum field theory has tended to focus on how it revises our conception of what a particle is. However, there has been relatively little discussion of the threat to the "reality" of particles posed by the possibility of ...
Halvorson, Hans, Clifton, Rob
core  

Canonical methods in classical and quantum gravity: An invitation to canonical LQG

, 2018
Loop Quantum Gravity (LQG) is a candidate quantum theory of gravity still under construction. LQG was originally conceived as a background independent canonical quantization of Einstein’s general relativity theory.
Juan D Reyes
core   +1 more source