Results 111 to 120 of about 699,691 (266)

TIME IN QUANTUM GRAVITY [PDF]

International Journal of Modern Physics D, 2001
The Wheeler–DeWitt equation in quantum gravity is timeless in character. In order to discuss quantum to classical transition of the universe, one uses a time prescription in quantum gravity to obtain a time contained description starting from Wheeler–DeWitt equation and WKB ansatz for the WD wavefunction. The approach has some drawbacks. In this work,
B. Modak, A. Shaw, S. Biswas
openaire   +3 more sources

Matrix Models, Emergent Gravity, and Gauge Theory

, 2009
Matrix models of Yang-Mills type induce an effective gravity theory on 4-dimensional branes, which are considered as models for dynamical space-time. We review recent progress in the understanding of this emergent gravity.
Austing P, Grosse H, Harold Steinacker, Klammer D, Matusis A, Minwalla S, Sakharov A D, Sakharov A D, Seiberg N, Steinacker H, Steinacker H   +10 more
core   +1 more source

Newtonian gravity in loop quantum gravity [PDF]

arXiv, 2010
We apply a recent argument of Verlinde to loop quantum gravity, to conclude that Newton's law of gravity emerges in an appropriate limit and setting. This is possible because the relationship between area and entropy is realized in loop quantum gravity when boundaries are imposed on a quantum spacetime.
arxiv  

Krylov complexity for Jacobi coherent states

Journal of High Energy Physics
We develop computational tools necessary to extend the application of Krylov complexity beyond the simple Hamiltonian systems considered thus far in the literature.
S. Shajidul Haque, Jeff Murugan, Mpho Tladi, Hendrik J. R. Van Zyl   +3 more
doaj   +1 more source

A New Class of Group Field Theories for 1st Order Discrete Quantum Gravity

, 2007
Group Field Theories, a generalization of matrix models for 2d gravity, represent a 2nd quantization of both loop quantum gravity and simplicial quantum gravity.
Baez J C, Barrett J W, D Oriti, Engle J Pereira R Rovelli C, Freidel L, Freidel L, Freidel L Krasnov K, Freidel L Krasnov K Oriti D, Gelfand I M, Gradshteyn I S, Hamber H W, Hermann R, Livine E Speziale S, Oriti D, Oriti D, Oriti D, Oriti D, Perez A, Perez A Bojowald M, Reisenberger M, Rivers R J, Rovelli C, T Tlas, Williams R   +23 more
core   +1 more source

Cosmological Spectrum of Two-Point Correlation Function from Vacuum Fluctuation of Stringy Axion Field in De Sitter Space: A Study of the Role of Quantum Entanglement

Universe, 2020
In this work, we study the impact of quantum entanglement on the two-point correlation function and the associated primordial power spectrum of mean square vacuum fluctuation in a bipartite quantum field theoretic system.
Sayantan Choudhury, Sudhakar Panda
doaj   +1 more source

Kant and Quantum Gravity [PDF]

arXiv, 2016
In quantum gravity space and time lose their status as fundamental parts of the physical reality. However, according to Kant, space and time are the a priori conditions of our experience. Does Kantian characterization of these notions give constraints to quantum gravity, or does quantum gravity make Kantian characterization of space and time an invalid
arxiv  

Constructing local bulk observables in interacting AdS/CFT

, 2011
Local operators in the bulk of AdS can be represented as smeared operators in the dual CFT. We show how to construct these bulk observables by requiring that the bulk operators commute at spacelike separation.
Daniel Kabat, David A. Lowe, E. Witten, Gilad Lifschytz, J. M. Maldacena, K. V. Time and Interpretations of Quantum Gravity   +5 more
core   +2 more sources

Relational Lorentzian Asymptotically Safe Quantum Gravity: Showcase Model

Universe
In a recent contribution, we identified possible points of contact between the asymptotically safe and canonical approaches to quantum gravity. The idea is to start from the reduced phase space (often called relational) formulation of canonical quantum ...
Renata Ferrero, Thomas Thiemann
doaj   +1 more source

Strings, loops and others: a critical survey of the present approaches to quantum gravity [PDF]

arXiv, 1998
I review the present theoretical attempts to understand the quantum properties of spacetime. In particular, I illustrate the main achievements and the main difficulties in: string theory, loop quantum gravity, discrete quantum gravity (Regge calculus, dynamical triangulations and simplicial models), Euclidean quantum gravity, perturbative quantum ...
arxiv