Results 21 to 30 of about 2,700,632 (80)

Quantum cosmology of the Big Rip: Within GR and in a modified theory of gravity

, 2017
Quantum gravity is the theory that is expected to successfully describe systems that are under strong gravitational effects while at the same time being of an extreme quantum nature.
M. Bouhmadi-López, Imanol Albarran, Che-Yu Chen   +2 more
semanticscholar   +1 more source

Measure problem in slow roll inflation and loop quantum cosmology [PDF]

, 2010
We consider the measure problem in standard slow-roll inflationary models from the perspective of loop quantum cosmology (LQC). Following recent results by Ashtekar and Sloan, we study the probability of having enough e-foldings and focus on its ...
Alejandro Corichi, A. Karami
semanticscholar   +1 more source

Quantum Cosmology [PDF]

, 1993
An elementary review of quantum cosmology. (Talk given at Texas/Pascos 1992 at Berkeley)
arxiv   +1 more source

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

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
core   +5 more sources

Can chaos be observed in quantum gravity?

, 2017
Full general relativity is almost certainly 'chaotic'. We argue that this entails a notion of nonintegrability: a generic general relativistic model, at least when coupled to cosmologically interesting matter, likely possesses neither differentiable ...
Dittrich, Bianca, Hoehn, Philipp A., Koslowski, Tim A., Nelson, Mike I.   +3 more
core   +1 more source

Loop Quantum Cosmology: Recent Progress

, 2004
Aspects of the full theory of loop quantum gravity can be studied in a simpler context by reducing to symmetric models like cosmological ones. This leads to several applications where loop effects play a significant role when one is sensitive to the ...
A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Ashtekar, A Okolow, C Rovelli, C Rovelli, C Rovelli, C Rovelli, G M Hossain, G W Gibbons, J F Barbero, J Z Simon, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, M Bojowald, Martin Bojowald, P Singh, T Thiemann, T Thiemann, V A Belinskii, V Husain   +35 more
core   +1 more source

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

Quantum Effects on Cosmic Scales as an Alternative to Dark Matter and Dark Energy [PDF]

Universe
The spin-torsion theory is a gauge theory approach to gravity that expands upon Einstein’s general relativity (GR) by incorporating the spin of microparticles. In this study, we further develop the spin-torsion theory to examine spherically symmetric and
Daxiu Chen, Lin Wang
semanticscholar   +1 more source

A no-singularity scenario in loop quantum gravity

, 2012
Canonical methods allow the derivation of effective gravitational actions from the behavior of space-time deformations reflecting general covariance.
Ashtekar A, Ashtekar A, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Cailleteau T Mielczarek J Barrau A Grain J, Date G, George M Paily, Henderson A Laddha A Tomlin C, Kreienbuehl A, Martin Bojowald, Perez A, Rendall A D, Reyes J D, Rovelli C, Rovelli C, Thiemann T, Thiemann T   +23 more
core   +1 more source