Results 1 to 10 of about 20,703 (57)

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.
core   +2 more sources

Towards a background independent approach to M theory [PDF]

, 1998
Work in progress is described which aims to construct a background independent formulation of M theory by extending results about background independent states and observables from quantum general relativity and supergravity to string theory.
Amati, Armand-Ugon, Ashtekar, Ashtekar, Ashtekar, Ashtekar, Ashtekar, Ashtekar, Ashtekar, Aspinwall, Aspinwall, Atick, Bak, Banados, Banks, Bekenstein, Borissov, Borissov, Connes, Connes, Crane, Crane, Crane, DePietri, Dijkgraaf, Douglas, Duff, Duff, Duff, Ezawa, Finkelstein, Finkelstein, Finkelstein, Finkelstein, Garay, Greene, Greene, Gross, Gross, Gubser, Guida, Hull, Hull, Iwasaki, Jacobson, Jaocobson, Kadoyoshi, Kato, Klebanov, Kodama, Konishi, Kunitomo, Landi, Landi, Lee Smolin, Loll, Loll, Major, Markopoulou, Markopoulou, Markopoulou, Markopoulou, Penrose, Penrose, Penrose, Rayner, Rayner, Reisenberger, Rovelli, Rovelli, Rovelli, Rovelli, Rovelli, Rovelli, Sano, Smolin, Smolin, Smolin, Smolin, Smolin, Smolin, Smolin, Strominger, Susskind, Susskind, Susskind, Susskind, Thorne, Townsend, Townsend, Veneziano, Waelbroeck, Waelbroeck, Witten   +93 more
core   +3 more sources

Heun Functions and Some of Their Applications in Physics

Advances in High Energy Physics, Volume 2018, Issue 1, 2018., 2018
Most of the theoretical physics known today is described by using a small number of differential equations. For linear systems, different forms of the hypergeometric or the confluent hypergeometric equations often suffice to describe the system studied.
M. Hortaçsu, Saber Zarrinkamar
wiley   +1 more source

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

Optimized Reputable Sensing Participants Extraction for Participatory Sensor Networks

Mathematical Problems in Engineering, Volume 2014, Issue 1, 2014., 2014
By collecting data via sensors embedded personal smart devices, sensing participants play a key role in participatory sensor networks. Using information provided by reputable sensing participants ensures the reliability of participatory sensing data.
Weiwei Yuan, Donghai Guan, Yuanfeng Jin, Lu Zhen   +3 more
wiley   +1 more source

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
core   +4 more sources

From Physics Model to Results: An Optimizing Framework for Cross‐Architecture Code Generation

Scientific Programming, Volume 21, Issue 1-2, Page 1-16, 2013., 2013
Starting from a high‐level problem description in terms of partial differential equations using abstract tensor notation, the Chemora framework discretizes, optimizes, and generates complete high performance codes for a wide range of compute architectures. Chemora extends the capabilities of Cactus, facilitating the usage of large‐scale CPU/GPU systems
Marek Blazewicz, Ian Hinder, David M. Koppelman, Steven R. Brandt, Milosz Ciznicki, Michal Kierzynka, Frank Löffler, Erik Schnetter, Jian Tao   +8 more
wiley   +1 more source

(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

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
core   +1 more source