Results 41 to 50 of about 7,337,627 (324)

Oscillating Stars and the Evidence of Dark Matter. A Comment on “Can the Periodic Spectral Modulations Observed in 236 Sloan Sky Survey Stars Be Due To Dark Matter Effects?” by F. Tamburini and I. Licata

Universe, 2017
Dark matter is probably the most fascinating enigma of modern physics [...]
Salvatore Capozziello
doaj   +1 more source

Non-linear obstructions for consistent new general relativity [PDF]

Journal of Cosmology and Astroparticle Physics, 2019
We revisit the field content and consistency of the New General Relativity family of theories. These theories are constructed in a geometrical framework with a flat and metric-compatible connection, so the affine structure is entirely determined by the ...
J. Jim'enez, K. Dialektopoulos
semanticscholar   +1 more source

Relative divergence of finitely generated groups [PDF]

Algebr. Geom. Topol. 15 (2015) 1717-1769, 2014
We generalize the concept of divergence of finitely generated groups by introducing the upper and lower relative divergence of a finitely generated group with respect to a subgroup. Upper relative divergence generalizes Gersten's notion of divergence, and lower relative divergence generalizes a definition of Cooper-Mihalik.
arxiv   +1 more source

Testing general relativity with present and future astrophysical observations [PDF]

, 2015
One century after its formulation, Einstein's general relativity (GR) has made remarkable predictions and turned out to be compatible with all experimental tests.
E. Berti, E. Berti, E. Barausse, V. Cardoso, V. Cardoso, L. Gualtieri, P. Pani, P. Pani, U. Sperhake, U. Sperhake, U. Sperhake, L. Stein, L. Stein, N. Wex, Kent Yagi, Kent Yagi, T. Baker, C. Burgess, C. Burgess, Fl'avio S. Coelho, D. Doneva, A. D. Felice, P. Ferreira, P. Freire, J. Healy, C. Herdeiro, M. Horbatsch, B. Kleihaus, A. Klein, K. Kokkotas, J. Kunz, P. Laguna, R. Lang, R. Lang, R. Lang, T. Li, T. Li, T. Littenberg, A. Matas, S. Mirshekari, Hirotada Okawa, E. Radu, R. O’Shaughnessy, R. O’Shaughnessy, B. Sathyaprakash, C. Broeck, H. Winther, Helvi Witek, Mirhossein Aghili, Justin Alsing, B. Bolen, L. Bombelli, S. Caudill, Liangxu Chen, J. C. Degollado, R. Fujita, C. Gao, D. Gerosa, Saeed Kamali, Hector O. Silva, J. G. Rosa, L. Sadeghian, Marco O. P. Sampaio, H. Sotani, M. Zilhão   +64 more
semanticscholar   +1 more source

Cylindrical systems in general relativity [PDF]

Classical and quantum gravity, 2019
With the arrival of the era of gravitational wave astronomy, the strong gravitational field regime will be explored soon in various aspects. In this article, we provide a general review over cylindrical systems in Einstein’s theory of general relativity.
K. Bronnikov, N. Santos, Anzhong Wang
semanticscholar   +1 more source

Quo Vadis, Mathematical General Relativity? [PDF]

arXiv, 2021
A review of selected topics in mathematical general ...
arxiv  

POINTLESS SPACES IN GENERAL RELATIVITY [PDF]

, 1995
The new approach to quantize the gravity based on the notion of differential algebra is suggested. It is shown that the differential geometry of this object can not be described in terms of points.
C. J. Isham, G. N. Parfionov, M. Dubois-Violette, M. F. Atiyah, M. Heller, P. Multarzinski, R. Geroch, R. R. Zapatrin, R. R. Zapatrin, R. R. Zapatrin, S. W. Hawking   +10 more
core   +3 more sources

Coincident general relativity [PDF]

Physical Review D, 2017
The Palatini's device is applied to generate teleparallel and symmetric teleparallel theories of gravity. From the latter is discovered an exceptional class which is consistent with a vanishing affine connection.
J. B. Jiménez, Lavinia Heisenberg, T. Koivisto   +2 more
semanticscholar   +1 more source

The 3+1 formalism in teleparallel and symmetric teleparallel gravity

European Physical Journal C: Particles and Fields, 2021
Teleparallel and symmetric teleparallel gravity offer platforms in which gravity can be formulated in interesting geometric approaches, respectively given by torsion and nonmetricity. In this vein, general relativity can be expressed in three dynamically
Salvatore Capozziello, Andrew Finch, Jackson Levi Said, Alessio Magro   +3 more
doaj   +1 more source

Anisotropic Stars in General Relativity [PDF]

, 2001
We present a class of exact solutions of Einstein's gravitational field equations describing spherically symmetric and static anisotropic stellar type configurations. The solutions are obtained by assuming a particular form of the anisotropy factor.
Harko, T., Mak, M. K.
core   +5 more sources