Results 11 to 20 of about 122,594 (207)

Geometrodynamics in a spherically symmetric, static crossflow of null dust [PDF]

, 2006
The spherically symmetric, static spacetime generated by a crossflow of non-interacting radiation streams, treated in the geometrical optics limit (null dust) is equivalent to an anisotropic fluid forming a radiation atmosphere of a star.
László Á. Gergely, P. A. M. Dirac, R. Arnowitt, Zoltán Kovács, Zsolt Horváth   +4 more
core   +1 more source

Quasinormal modes for the Vaidya metric [PDF]

, 2006
We consider here scalar and electromagnetic perturbations for the Vaidya metric in double-null coordinates. Such an approach allows one to go a step further in the analysis of quasinormal modes for time-dependent spacetimes.
Alberto Saa, Cecilia B. M. H. Chirenti, Elcio Abdalla, K. D. Kokkotas   +3 more
core   +2 more sources

Collapsing shells of radiation in anti-de Sitter spacetimes and the hoop and cosmic censorship conjectures [PDF]

, 1998
Gravitational collapse of radiation in an anti-de Sitter background is studied. For the spherical case, the collapse proceeds in much the same way as in the Minkowski background, i.e., massless naked singularities may form for a highly inhomogeneous ...
A. Ori, A. Papapetrou, A. Taub, D. Christodoulou, D. M. Eardley, D. W. Jordan, I. H. Dwivedi, J. P. S. Lemos, J. P. S. Lemos, J. P. S. Lemos, J. P. S. Lemos, J. P. S. Lemos, José P. S. Lemos, K. Lake, K. Lake, L. Vanzo, P. S. Joshi, P. S. Joshi, R. Penrose, S. L. Shapiro, T. A. Apostolatos, W. A. Hiscock   +21 more
core   +2 more sources

Semi-analytical approach for the Vaidya metric in double-null coordinates

, 2004
We reexamine here a problem considered in detail before by Waugh and Lake: the solutions of spherically symmetric Einstein's equations with a radial flow of unpolarized radiation (the Vaidya metric) in double-null coordinates. This problem is known to be
Alberto Saa, B.-L. Hu, Fernando Girotto, H. Stephani, J. Synge, P. S. Joshi, S. W. Hawking, Y. Kuroda, Y. Kuroda, Y. Kuroda   +9 more
core   +1 more source

Gravitational radiation from dynamical black holes

, 2005
An effective energy tensor for gravitational radiation is identified for uniformly expanding flows of the Hawking mass-energy. It appears in an energy conservation law expressing the change in mass due to the energy densities of matter and gravitational ...
Bondi H, Bondi H, Bray H, Hayward S A, Hayward S A, Hayward S A Mars M Simon W, Huisken G, Mars M, Penrose R, Sachs R K, Schnetter E, Sean A Hayward, Tod K P   +12 more
core   +1 more source

Relativistic Acoustic Geometry [PDF]

, 1999
Sound wave propagation in a relativistic perfect fluid with a non-homogeneous isentropic flow is studied in terms of acoustic geometry. The sound wave equation turns out to be equivalent to the equation of motion for a massless scalar field propagating ...
(Visser M, Brout R, Corley S, Hawking S W, Jacobson T, Jacobson T, Jacobson T, Landau L D, Neven Bilic, Taub A H, Taub A H, Unruh W G, Visser M, Wald R M, Wald R M   +14 more
core   +3 more sources

Simulation of Acoustic Black Hole in a Laval Nozzle

, 2006
A numerical simulation of fluid flows in a Laval nozzle is performed to observe formations of acoustic black holes and the classical counterpart to Hawking radiation under a realistic setting of the laboratory experiment.
Barceló C, Barceló C, Birrell N D, Frolov Y P, Hiromi Saida, Hironobu Furuhashi, Nouri-Zonoz M Padmanabhan T, Novello M, Visser M, Yasusada Nambu   +9 more
core   +1 more source

Mechanics of Rotating Isolated Horizons [PDF]

, 2001
Black hole mechanics was recently extended by replacing the more commonly used event horizons in stationary space-times with isolated horizons in more general space-times (which may admit radiation arbitrarily close to black holes).
A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Corichi, Abhay Ashtekar, Christopher Beetle, G. Gibbons, J. W. Bardeen, Jerzy Lewandowski   +14 more
core   +2 more sources

Where is the charm quark energy loss at RHIC? [PDF]

, 2003
Heavy quark energy loss in a hot QCD plasma is computed taking into account the competing effects due to suppression of zeroth order gluon radiation below the plasma frequency and the enhancement of gluon radiation due to first order medium induced ...
Adcox, Adcox, Adler, Adler, Adler, Baier, Baier, Baier, Batsouli, Biro, Braaten, Braaten, Dokshitzer, Filimonov, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Kalashnikov, Kampfer, Klimov, Kunde, Levai, Levai, Lin, Lin, Magdalena Djordjevic, Miklos Gyulassy, Mioduszewski, Mustafa, Peshier, Pisarski, Rebhan, Rebhan, Salgado, Selikhov, Selikhov, Shuryak, Ter-Mikayelian, Ter-Mikayelian, Wang, Wang, Wang, Wang, Wang, Wang, Wiedemann, Wiedemann, Wiedemann, Zhakharov   +55 more
core   +3 more sources

Shared Genetic Effects and Antagonistic Pleiotropy Between Multiple Sclerosis and Common Cancers

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Epidemiologic studies have reported inconsistent altered cancer risk in individuals with multiple sclerosis (MS). Factors such as immune dysregulation, comorbidities, and disease‐modifying therapies may contribute to this variability.
Asli Buyukkurt, Marius Ygonia, Ali Manouchehrinia, Philippe Lefrançois, Ingrid Kockum, Adil Harroud   +5 more
wiley   +1 more source