Results 11 to 20 of about 20,602 (71)

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

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

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

Nonmetricity formulation of general relativity and its scalar-tensor extension

, 2018
Einstein's celebrated theory of gravitation can be presented in three forms: general relativity, teleparallel gravity, and the rarely considered before symmetric teleparallel gravity.
Järv, Laur, Rünkla, Mihkel, Saal, Margus, Vilson, Ott   +3 more
core   +1 more source

Relational Motivation for Conformal Operator Ordering in Quantum Cosmology

, 2009
Operator-ordering in quantum cosmology is a major as-yet unsettled ambiguity with not only formal but also physical consequences. We determine the Lagrangian origin of the conformal invariance that underlies the conformal operator-ordering choice in ...
Anderson, Edward
core   +1 more source

Hubble operator in isotropic loop quantum cosmology

, 2003
We present a construction of the Hubble operator for the spatially flat isotropic loop quantum cosmology. This operator is a Dirac observable on a subspace of the space of physical solutions.
Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M Vandersloot K, Date G, Dirac P A M, Fernando J, Gaul M, Golam Mortuza Hossain, Immirzi G, Kodama H, Misner C W, Perez A Rovelli C, Rovelli C, Rovelli C, Smolin L, Thiemann T, Thiemann T, Thiemann T   +26 more
core   +1 more source

The Semiclassical Limit of Loop Quantum Cosmology [PDF]

, 2001
The continuum and semiclassical limits of isotropic, spatially flat loop quantum cosmology are discussed, with an emphasis on the role played by the Barbero-Immirzi parameter \gamma in controlling space-time discreteness.
Ashtekar A, Ashtekar A, Ashtekar A, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bombelli L, Bombelli L, Corichi A, Karasev M V, Martin Bojowald, Rovelli C, Sahlmann H, Thiemann T, Thiemann T, Varadarajan M   +20 more
core   +3 more sources

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

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

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