Results 151 to 160 of about 9,570 (308)

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

, 2012
According to Penrose, the fundamental conflict between the superposition principle of quantum mechanics and the general covariance principle of general relativity entails the existence of wavefunction collapse, e.g.
Gao, Shan
core  

Phases of tree-decorated Dynamical Triangulations in 3D

Journal of High Energy Physics
This work revisits the Euclidean Dynamical Triangulation (DT) approach to non-perturbative quantum gravity in three dimensions. Inspired by a recent combinatorial study [1] of a subclass of 3-sphere triangulations constructed from trees, called the ...
Timothy Budd, Dániel Németh
doaj   +1 more source

Branes in JT (super)gravity from group theory

Journal of High Energy Physics
In this work, we revisit the end-of-the-world (EOW) brane amplitudes in JT gravity from a BF gauge theoretic perspective. Observing and identifying the correct group theoretic ingredient for a closed EOW brane as a discrete series character, we use the ...
Andreas Belaey, Francesca Mariani, Thomas G. Mertens   +2 more
doaj   +1 more source

Model Categories and Quantum Gravity

, 2008
We propose a mathematically concrete way of modelling the suggestion that in quantum gravity the spacetime disappears, replacing it with a discrete approximation to the causal path space described as an object in a model category. One of the versions of our models appears as a thickening of spacetime, which we interpret as a formulation of relational ...
openaire   +2 more sources

Testing quantum gravity with primordial gravitational waves

Journal of High Energy Physics
We propose a testable alternative to inflation directly built in a very general class of ultraviolet complete theories of quantum gravity enjoying Weyl invariance.
Gianluca Calcagni, Leonardo Modesto
doaj   +1 more source

Quantum pre-geometry models for Quantum Gravity [PDF]

, 2012
In this thesis we review the status of an approach to Quantum Gravity through lattice toy models, Quantum Graphity. In particular, we describe the two toy models introduced in the literature and describe with a certain level of details the results ...
Francesco, Caravelli
core  

Quantum time delay in the gravitational field of a rotating mass

, 2017
We examine quantum corrections of time delay arising in the gravitational field of a spinning oblate source. Low-energy quantum effects occurring in Kerr geometry are derived within a framework where general relativity is fully seen as an effective field
Simo, Jules, Battista, Emmanuele, Luciano Di Fiore, Emmanuele Battista, Dell’Agnello, Simone, Matteo Luca Ruggiero, Simone Dell’Agnello, David Lucchesi, Aniello Grado, Lucchesi, David, Tartaglia, Angelo, Grado, Aniello, Di Fiore, Luciano, Angelo Tartaglia, Jules Simo, Esposito, Giampiero, Ruggiero, Matteo Luca, Giampiero Esposito, Pavol Valko, Valko, Pavol, Dell'Agnello, Simone   +20 more
core   +1 more source

Spontaneous collapse models lead to the emergence of classicality of the Universe

Journal of High Energy Physics
Assuming that Quantum Mechanics is universal and that it can be applied over all scales, then the Universe is allowed to be in a quantum superposition of states, where each of them can correspond to a different space-time geometry.
José Luis Gaona-Reyes, Lucía Menéndez-Pidal, Mir Faizal, Matteo Carlesso   +3 more
doaj   +1 more source

On the Metaphysics of Quantum Mechanics [PDF]

, 2012
What is quantum mechanics about? The most natural way to interpret quantum mechanics realistically as a theory about the world might seem to be what is called wave function ontology: the view according to which the wave function mathematically ...
Allori, Valia
core  

Emergent time and more from wavefunction collapse in general relativity

Journal of High Energy Physics
In this paper, we further develop a recently proposed theory of time based on wavefunction collapse in general relativity. It is based on the postulations that quantum states, which violate the momentum and Hamiltonian constraints, represent instances of
Sung-Sik Lee
doaj   +1 more source