Results 1 to 10 of about 20,687 (58)

What is General Relativity? [PDF]

, 2017
General relativity is a set of physical and geometric principles, which lead to a set of (Einstein) field equations that determine the gravitational field, and to the geodesic equations that describe light propagation and the motion of particles on the ...
Coley, Alan A., Wiltshire, David L.
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The volume operator in covariant quantum gravity [PDF]

, 2010
A covariant spin-foam formulation of quantum gravity has been recently developed, characterized by a kinematics which appears to match well the one of canonical loop quantum gravity.
Alexandrov S, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A Campiglia M Henderson A, Baez J C, Barrett J W, Battisti M V Marciano A Rovelli C, Bianchi E Rovelli C Vidotto F, Carlo Rovelli, Engle J, Flori C, Flori C Thiemann T, Freidel L, Iwasaki J, Livine E, Noui K, Oriti D, Pereira R, Perez A, Reisenberger M P, Reisenberger M P, Reisenberger M P, Reisenberger M P, Rovelli C, Rovelli C, Rovelli C, Rovelli C Vidotto F, Smolin L, Thiemann T, You Ding   +30 more
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(Loop) quantum gravity and the inflationary scenario [PDF]

, 2015
Quantum gravity, as a fundamental theory of space-time, is expected to reveal how the universe may have started, perhaps during or before an inflationary epoch.
Bojowald, Martin
core   +2 more sources

Quantization of Midisuperspace Models [PDF]

, 2010
We give a comprehensive review of the quantization of midisuperspace models. Though the main focus of the paper is on quantum aspects, we also provide an introduction to several classical points related to the definition of these models.
A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Corichi, A Corichi, A Corichi, A Corichi, A Corichi, A Corichi, A Einstein, A Franzen, A Peltola, A Peltola, AD Helfer, AE Fischer, AS Lapedes, BG Schmidt, BK Berger, BK Berger, BK Berger, BK Berger, BK Berger, BS DeWitt, BS DeWitt, BS DeWitt, C Bartolo Di, C Bartolo Di, C Beetle, C Charach, C Charach, C Charach, C Fleischhack, C Kiefer, C Kiefer, C Kiefer, C Kiefer, C Vaz, C Vaz, C Vaz, C Vaz, C Vaz, C Vaz, C Vaz, C Vaz, C Vaz, CG Böhmer, CG Callan Jr, CG Torre, CG Torre, CG Torre, CG Torre, CG Torre, CG Torre, CG Torre, CG Torre, CJS Clarke, CW Misner, CW Misner, CW Misner, D Brizuela, D Chiou, D Giulini, D Gómez Vergel, D Gómez Vergel, D Kennefick, D Korotkin, D Korotkin, D Korotkin, D Korotkin, D Maison, D Shale, DE Neville, DE Neville, DE Neville, DHJ Cho, F Lund, G Beck, G Bonacina, GA Mena Marugán, GA Mena Marugán, GA Mena Marugán, GA Mena Marugán, GJF Barbero, GJF Barbero, GJF Barbero, GJF Barbero, GJF Barbero, GJF Barbero, GJF Barbero, GJF Barbero, GJF Barbero, GJF Barbero, GJF Barbero, H Osborn, H Stephani, HA Kastrup, HA Kastrup, HW Braden, I Bengtsson, I Kouletsis, IM Singer, J Bekenstein, J Cortez, J Cortez, J Cortez, J Cortez, J Cruz, J Engle, J Gegenberg, J Isenberg, J Lewandowski, J Louko, J Louko, J Louko, J Louko, J Louko, J Mäkelä, J Samuel, J Szenthe, JD Brown, JD Romano, JL Friedman, JW York Jr, K Banerjee, K Banerjee, KV Kuchař, KV Kuchař, KV Kuchař, KV Kuchař, L Modesto, L Modesto, L Modesto, L Modesto, L Modesto, L Modesto, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Campiglia, M Campiglia, M Carmeli, M Carmeli, M Cavaglià, M Cavaglià, M Henneaux, M Martín-Benito, M McGuigan, M Pierri, M Varadarajan, M Varadarajan, M Varadarajan, M Varadarajan, ME Angulo, ME Fels, MJ Gotay, MP Ryan Jr, N Manojlovioć, NMJ Woodhouse, P Hájíček, P Hájíček, P Hájíček, P Hájíček, P Hájíček, P Hájíček, P Hájíček, P Hájíček, PK Mitter, PS Mostert, PS Mostert, PT Chruściel, R Borissov, R Gambini, R Gambini, R Gambini, R Gambini, R Siegl, RH Gowdy, RH Gowdy, RM Wald, RM Wald, RP Geroch, RP Geroch, RS Palais, RT Jantzen, S Bose, S Chandrasekhar, S Holst, T Jacobson, T Regge, T Thiemann, V Husain, V Husain, V Husain, V Husain, V Husain, V Husain, V Husain, V Husain, V Husain, V Husain, V Husain, V Moncrief, VA Berezin, VF Mukhanov, WG Unruh   +216 more
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Simple quantum cosmology: Vacuum energy and initial state

, 2005
A static non-singular 10-dimensional closed Friedmann universe of Planck size, filled with a perfect fluid with an equation of state with w = -2/3, can arise spontaneously by a quantum fluctuation from nothing in 11-dimensional spacetime.
D. Spergel, D. Youm, E. Elbaz, M. Novello, M. Tegmark, S. Alexander, S. Eidelman, T. R. Mongan, T.R. Mongan   +8 more
core   +2 more sources

Reconstruction of mimetic gravity in a non-singular bouncing universe from quantum gravity

, 2019
We illustrate a general reconstruction procedure for mimetic gravity. Focusing on a bouncing cosmological background, we derive general properties that must be satisfied by the function $f(\Box\phi)$ implementing the limiting curvature hypothesis.
de Cesare, Marco
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Beables/Observables in Classical and Quantum Gravity [PDF]

, 2014
Observables 'are observed' whereas beables just 'are'. This gives beables more scope in the cosmological and quantum domains. Both observables and beables are entities that form 'brackets' with 'the constraints' that are 'equal to' zero.
Anderson, Edward
core   +3 more sources

Introduction to Loop Quantum Cosmology [PDF]

, 2012
This is an introduction to loop quantum cosmology (LQC) reviewing mini- and midisuperspace models as well as homogeneous and inhomogeneous effective ...
Banerjee, Kinjal, Calcagni, Gianluca, Martín-Benito, Mercedes   +2 more
core   +5 more sources

Covariant action for bouncing cosmologies in modified Gauss-Bonnet gravity

, 2019
Cyclic universes with bouncing solutions are candidates for solving the big bang initial singularity problem. Here we seek bouncing solutions in a modified Gauss-Bonnet gravity theory, of the type $R+f(G)$, where $R$ is the Ricci scalar, $G$ is the Gauss-
Lemos, José P. S., Terrucha, Inês, Vernieri, Daniele   +2 more
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Loop Quantum Gravity: Four Recent Advances and a Dozen Frequently Asked Questions

, 2007
As per organizers' request, my talk at the 11th Marcel Grossmann Conference consisted of two parts. In the first, I illustrated recent advances in loop quantum gravity through examples.
Ashtekar, Abhay
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