Results 21 to 30 of about 20,675 (71)
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 morecore +1 more sourceBrane-world gravity [PDF]
, 2003 The observable universe could be a 1+3-surface (the "brane") embedded in a
1+3+d-dimensional spacetime (the "bulk"), with standard-model particles and
fields trapped on the brane while gravity is free to access the bulk.Maartens, Roycore +3 more sourcesA 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 morecore +1 more sourceLoop Quantum Cosmology, Boundary Proposals, and Inflation
, 2003 Loop quantum cosmology of the closed isotropic model is studied with a
special emphasis on a comparison with traditional results obtained in the
Wheeler-DeWitt approach.A. Ashtekar, A. Vilenkin, A. Vilenkin, B.S. DeWitt, C. Rovelli, C.W. Misner, G. Immirzi, H.D. Conradi, J.B. Hartle, J.F. Barbero G., Kevin Vandersloot, 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, N. Kontoleon, T. Thiemann, T. Thiemann +26 morecore +1 more sourceUnimodular Loop Quantum Cosmology
, 2010 Unimodular gravity is based on a modification of the usual Einstein-Hilbert
action that allows one to recover general relativity with a dynamical
cosmological constant.A. Ashtekar, A. Ashtekar, A. Einstein, C. Rovelli, C. J. Isham, D. Marolf, Dah-Wei Chiou, M. Bojowald, Marc Geiller, P. A. M. Dirac, R. M. Wald, S. Hawking, T. Thiemann +12 morecore +3 more sourcesOn the Physical Hilbert Space of Loop Quantum Cosmology
, 2004 In this paper we present a model of Riemannian loop quantum cosmology with a
self-adjoint quantum scalar constraint. The physical Hilbert space is
constructed using refined algebraic quantization.A. Ashtekar, Abhay Ashtekar, Abhay Ashtekar, Alejandro Perez, C. Rovelli, C. Rovelli, Karim Noui, Kevin Vandersloot, L. Smolin, Martin Bojowald +9 morecore +1 more sourceOn Higher Order Gravities, Their Analogy to GR, and Dimensional
Dependent Version of Duff's Trace Anomaly Relation
, 2005 An almost brief, though lengthy, review introduction about the long history
of higher order gravities and their applications, as employed in the
literature, is provided.A. Mardones, A. Salam, A.D. Dolgov, A.L. Berkin, B. Shahid-Saless, C. Romero, C.H. Brans, D.N. Vollick, E.S. Fradkin, F. Müller-Hoissen, G. Allemandi, G. Magnano, G. Stephenson, H.A. Buchdahl, H.A. Buchdahl, H.A. Buchdahl, I. Adler, I. Quant, J.A. Wheeler, J.C. Graves, J.D. Brown, J.T. Wheeler, J.Z. Simon, K.S. Stelle, K.S. Stelle, L. Amendola, L. Bonora, L. Bonora, M. Asorey, M. Farhoudi, M.E. Soussa, M.J. Duff, M.J. Duff, M.J. Duff, M.P. Ryan Jr., M.S. Madsen, Mehrdad Farhoudi, N. Deruelle, P. Teyssandier, P. Teyssandier, R. Bach, S. Carloni, S. Cecotti, S. Cnockaert, S. Deser, S. Deser, S. Gottlöber, S. Gottlöber, S. Nojiri, S. Nojiri, S. Nojiri, T. Chiba, T. Clifton, T. Fulton, V. Faraoni, W. Maluf +55 morecore +3 more sourcesLoop quantum gravity: the first twenty five years
, 2011 This is a review paper invited by the journal "Classical ad Quantum Gravity"
for a "Cluster Issue" on approaches to quantum gravity. I give a synthetic
presentation of loop gravity. I spell-out the aims of the theory and compare
the results obtained with Amelino-Camelia G, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Atiyah M, Baez J, Barrau A, Barrau A, Barrett J W Dowdall R J Fairbairn W J Hellmann F Pereira R, Bianchi E, Bianchi E, Bianchi E, Bianchi E Donà P Speziale S, Bianchi E Han M Magliaro E Perini C Rovelli C Wieland W, Bianchi E Han M Magliaro E Perini C Rovelli C Wieland W, Bianchi E Krajewski T Rovelli C Vidotto F, Bilson-Thompson S Markopoulou F Smolin L, Bojowald M, Calcagni G Gielen S Oriti D, Calmet X, Campiglia M Henderson A Nelson W, Carlo Rovelli, Ding Y, Ding Y Han M Rovelli C, Dittrich B, Dittrich B, Dittrich B, Dittrich B, Domagala M Giesel K Kaminski W Lewandowski J, Fairbairn W J Meusburger C, Fleischhack C, Freidel L, Freidel L Speziale S, Freidel L Speziale S, Geloun J B Gurau R Rivasseau V, Giesel K, Giesel K, Giesel K, Giesel K, Giesel K Tambornino J Thiemann T, Grain J Barrau A Cailleteau T Mielczarek J, Gurau R, Han M, Han M Rovelli C, Henderson A Rovelli C Vidotto F Wilson-Ewing E, Immirzi G, Immirzi G, Jacobson T, Kaminski W, Kaminski W, Krajewski T Magnen J Rivasseau V Tanasa A Vitale P, Livine E R, Livine E R, Major S, Major S A, Major S A, Martin-Benito M Garay L J Mena Marugan G A, Meissner K A, Mielczarek J, Minkowski H, Modesto L Premont-Schwarz I, Noui K, Oeckl R, Oriti D, Penrose R, Perez A, Ponzano G, Rivasseau V Wang Z, Rovelli C, Rovelli C, Rovelli C, Rovelli C, Rovelli C, Rovelli C, Rovelli C Smerlak M, Rovelli C Speziale S, Singh P, Singh P Vidotto F, Smolin L, Smolin L, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Wieland W +89 morecore +2 more sourcesCan black holes be torn up by phantom dark energy in cyclic cosmology?
, 2009 Infinitely cyclic cosmology is often frustrated by the black hole problem. It
has been speculated that this obstacle in cyclic cosmology can be removed by
taking into account a peculiar cyclic model derived from loop quantum cosmology
or the braneworld ...A. Ashtekar, A. Ashtekar, A. Ashtekar, B. Feng, C. Gao, E. Babichev, H.H. Xiong, J. Khoury, L. Baum, L. Randall, L. Randall, L.A. Boyle, M. Bojowald, M.G. Brown, P. Martin-Moruno, P. Singh, P.F. Gonzalez-Diaz, P.J. Steinhardt, P.J. Steinhardt, P.J. Steinhardt, R.C. Tolman, R.C. Tolman, R.R. Caldwell, R.R. Caldwell, V. Faraoni, X. Zhang, X. Zhang, Xin Zhang, Y. Shtanov +28 morecore +1 more source
