Results 71 to 80 of about 173,760 (383)

Discrete Lorentzian Quantum Gravity [PDF]

, 2000
Just as for non-abelian gauge theories at strong coupling, discrete lattice methods are a natural tool in the study of non-perturbative quantum gravity. They have to reflect the fact that the geometric degrees of freedom are dynamical, and that therefore
Loll, R.
core   +4 more sources

An effective matrix model for dynamical end of the world branes in Jackiw-Teitelboim gravity

Journal of High Energy Physics, 2022
We study Jackiw-Teitelboim gravity with dynamical end of the world branes in asymptotically nearly AdS2 spacetimes. We quantize this theory in Lorentz signature, and compute the Euclidean path integral summing over topologies including dynamical branes ...
Ping Gao, Daniel L. Jafferis, David K. Kolchmeyer   +2 more
doaj   +1 more source

Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity [PDF]

Journal of Cosmology and Astroparticle Physics
We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the primordial tensor spectrum is blue: ekpyrotic universe with fast ...
I. Ben-Dayan, G. Calcagni, M. Gasperini, Anupam Mazumdar, Eliseo Pavone, Udaykrishna Thattarampilly, Amresh Verma   +6 more
semanticscholar   +1 more source

Covariance in models of loop quantum gravity: Spherical symmetry [PDF]

, 2015
Spherically symmetric models of loop quantum gravity have been studied recently by different methods that aim to deal with structure functions in the usual constraint algebra of gravitational systems.
M. Bojowald, Suddhasattwa Brahma, J. Reyes   +2 more
semanticscholar   +1 more source

Quantum Cosmology of Generalized Two--Dimensional Dilaton Gravity Models [PDF]

, 1995
The quantum cosmology of two-dimensional dilaton-gravity models is investigated. A class of models is mapped onto the constrained oscillator-ghost-oscillator model.
A. A. Tseytlin, A. Abouelsaood, A. Giveon, A. Hosoya, A. Ishikawa, A. M. Polyakov, A. M. Polyakov, A. Miković, A. Vilenkin, A. Zhuk, A. Zhuk, B. S. DeWitt, C. Callan, C. Callan, C. Callan, C. G. Callan, C. Lanczos, C. Lovelace, C. R. Chester, D. Louis Martinez, D. N. Page, D. Zwillinger, E. Abdalla, E. Adi, E. Farhi, E. Fradkin, E. Witten, F. D. Mazzitelli, G. F. R. Ellis, G. Magnano, G. Moore, H. J. Schmidt, J. A. Wheeler, J. B. Hartle, J. Bene, J. Bene, J. E. Lidsey, J. G. Russo, J. G. Russo, J. Gegenberg, J. J. Halliwell, J. J. Halliwell, J. Klauder, J. Navarro Salas, J. Navarro Salas, J. Navarro Salas, J. Uglum, James E. Lidsey, K. Isler, K. Kikkawa, L. J. Garay, L. J. Garay, L. M. Campbell, M. "Onder, M. "Onder, M. Asano, M. B. Green, M. Born, M. Carreau, M. Claudson, M. D. McGuigan, M. Henneaux, M. Sakai, N. D. Birrell, N. Marcus, N. Seiberg, O. Obregón, O. Obregón, P. A. M. Dirac, P. D. D'Eath, P. Ginsparg, R. Capovilla, R. Graham, R. Graham, S. Mignemi, S. W. Hawking, S. W. Hawking, S. W. Hawking, S. W. Hawking, S. Wada, S. Wada, T. Banks, T. Dereli, T. Dereli, T. Dereli, T. H. Buscher, T. Hori, T. Thiemann, V. A. Rubakov, W. Fischler, W. Fischler   +90 more
core   +3 more sources

Some implications of signature-change in cosmological models of loop quantum gravity [PDF]

, 2015
Signature change at high density has been obtained as a possible consequence of deformed space-time structures in models of loop quantum gravity. This article provides a conceptual discussion of implications for cosmological scenarios, based on an ...
M. Bojowald, J. Mielczarek
semanticscholar   +1 more source

Spectral Flow in 3D Flat Spacetimes [PDF]

, 2017
In this paper we investigate spectral flow symmetry in asymptotically flat spacetimes both from a gravity as well as a putative dual quantum field theory perspective.
Basu, Rudranil, Detournay, Stéphane, Riegler, Max   +2 more
core   +1 more source

Covariance in models of loop quantum gravity: Gowdy systems [PDF]

, 2015
Recent results in the construction of anomaly-free models of loop quantum gravity have shown obstacles when local physical degrees of freedom are present.
M. Bojowald, Suddhasattwa Brahma
semanticscholar   +1 more source

Two dimensional nearly de Sitter gravity

Journal of High Energy Physics, 2021
We study some aspects of the de Sitter version of Jackiw-Teitelboim gravity. Though we do not have propagating gravitons, we have a boundary mode when we compute observables with a fixed dilaton and metric at the boundary.
Juan Maldacena, Gustavo J. Turiaci, Zhenbin Yang   +2 more
doaj   +1 more source

Midisuperspace Models of Canonical Quantum Gravity [PDF]

International Journal of Theoretical Physics, 1999
29 pages, RevTex, contribution to "Quantum Gravity in the Southern Cone II", Bariloche, Argentina, January 6-10 ...
openaire   +6 more sources