Results 71 to 80 of about 33,597 (156)

Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge Basalts

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 2, February 2024.
Abstract Owing to their abundance and relative availability on Earth's seafloor, mid‐ocean ridge basalts (MORBs) have a well‐defined chemical element budget, reflected by the low standard deviation associated with typical normal MORB (N‐MORB) composition. However, the exact mechanisms leading to magma differentiation and MORB generation remain debated,
Thomas Duvernay, Shihao Jiang, Patrick W. Ball, D. Rhodri Davies   +3 more
wiley   +1 more source

A study of stable wormhole solution with non-commutative geometry in the framework of linear $$f(R,{\mathcal {L}}_m, T)$$ f ( R , L m , T ) gravity

European Physical Journal C: Particles and Fields
This research delves into the potential existence of traversable wormholes (WHs) within the framework of modified, curvature based gravity. The modification includes linear perturbations of the matter Lagrangian and the trace of the energy-momentum ...
Niklas Loewer, Moreshwar Tayde, P. K. Sahoo   +2 more
doaj   +1 more source

Lensing by Kerr Black Holes. I: General Lens Equation and Magnification Formula

, 2011
We develop a unified, analytic framework for gravitational lensing by Kerr black holes. In this first paper we present a new, general lens equation and magnification formula governing lensing by a compact object. Our lens equation assumes that the source
Aazami, Amir B., Keeton, Charles R., Petters, A. O.   +2 more
core   +1 more source

Twisting shadows: Light rings, lensing, and shadows of black holes in swirling universes [PDF]

Physical Review D
Using the Ernst formalism, a novel solution of vacuum General Relativity was recently obtained [1], describing a Schwarzschild black hole (BH) immersed in a non-asymptotically flat rotating background, dubbed swirling universe, with the peculiar property
Zeus S. Moreira, C. Herdeiro, L. Crispino   +2 more
semanticscholar   +1 more source

Constraining dark energy fluctuations with supernova correlations

, 2010
We investigate constraints on dark energy fluctuations using type Ia supernovae. If dark energy is not in the form of a cosmological constant, that is if the equation of state is not equal to -1, we expect not only temporal, but also spatial variations ...
, A.R. Cooray, D.F. Mota, E. Komatsu ., Edvard Mörtsell, J.A. Holtzman ., J.A. Peacock, Jonas Enander, L.R. Abramo, M. Giovannini, M. Hicken ., M. {Blomqvist}, Michael Blomqvist, N. Kaiser, P. Zhang, R. Amanullah ., R. Kessler ., S. Gupta, Supernova Cosmology Project collaboration, T. Haugboelle ., T. Koivisto, T. Koivisto   +21 more
core   +1 more source

Formalism for testing theories of gravity using lensing by compact objects. III: Braneworld gravity

, 2006
Braneworld gravity is a model that endows physical space with an extra dimension. In the type II Randall-Sundrum braneworld gravity model, the extra dimension modifies the spacetime geometry around black holes, and changes predictions for the formation ...
A. O. Petters, A. O. Petters, B. J. Carr, C. S. Kochanek, Charles R. Keeton, K. S. Virbhadra, P. Schneider, R. Gregory, S. W. Hawking, T. Nakamura   +9 more
core   +1 more source

Applying Gravitational Lensing to Neutrino Flux

, 2018
In this paper, neutrinos’ behavior when interacting with gravity is discussed. Specifically, effect of applying gravitational lensing, which is often applied to visible light, to neutrino flux is discussed.
Li-Sha Xu
semanticscholar   +1 more source

An accurate equation for the gravitational bending of light by a static massive object [PDF]

Monthly notices of the Royal Astronomical Society
An exact analytical expression for the bending angle of light due to a non-rotating massive object, considering the actual distances from source and observer to the gravitational mass, is derived.
O. del Barco
semanticscholar   +1 more source

Observing gravitational lensing effects by Sgr A* with GRAVITY

, 2012
The massive black hole at the Galactic center Sgr A* is surrounded by a cluster of stars orbiting around it. Light from these stars is bent by the gravitational field of the black hole, giving rise to several phenomena: astrometric displacement of the ...
Bozza, V., Mancini, L.
core   +1 more source

Gravitational Lensing and f(R) theories in the Palatini approach

, 2008
We investigate gravitational lensing in the Palatini approach to the f(R) extended theories of gravity. Starting from an exact solution of the f(R) field equations, which corresponds to the Schwarzschild-de Sitter metric and, on the basis of recent ...
A. Starobinski, A.G. Riess, A.L. Erickcek, A.O. Petters, C.B. Netterfield, C.L. Bennet, C.S. Kochanek, D. Barraco, D.N. Vollick, G. Allemandi, G. Allemandi, G. Allemandi, G. Allemandi, G.J. Olmo, G.J. Olmo, G.J. Olmo, G.M. Kremer, H.A. Buchdahl, J.L. Tonry, K. Lake, K.S. Virbhadra, M. Ferraris, M. Ferraris, Matteo Luca Ruggiero, N. Straumann, N.W. Halverson, P. Schneider, P.J.E. Peebles, S. Capozziello, S. Nojiri, S. Nojiri, S. Nojiri, S. Perlmutter, T. Chiba, T. Chiba, T.P. Sotiriou, T.P. Sotiriou, V. Faraoni, W. Rindler, X.H. Meng, X.H. Meng   +40 more
core   +1 more source