Results 71 to 80 of about 34,517 (164)

The theory of stochastic cosmological lensing

, 2015
On the scale of the light beams subtended by small sources, e.g. supernovae, matter cannot be accurately described as a fluid, which questions the applicability of standard cosmic lensing to those cases.
Fleury, Pierre, Larena, Julien, Uzan, Jean-Philippe   +2 more
core   +2 more sources

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 (GR) was recently obtained [1], describing a Schwarzschild black hole (BH) immersed in a nonasymptotically flat rotating background, dubbed swirling universe, with the peculiar ...
Zeus S. Moreira, C. Herdeiro, L. Crispino   +2 more
semanticscholar   +1 more source

Viscosity Measurements at High Pressures: A Critical Appraisal of Corrections to Stokes' Law

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 5, May 2024.
Abstract Fluids and melts in planetary interiors significantly influence geodynamic processes from volcanism to global‐scale differentiation. The roles of these geofluids depend on their viscosities (η). Constraining geofluid η at relevant pressures and temperatures relies on laboratory‐based measurements and is most widely done using Stokes' Law ...
Aaron Wolfgang Ashley, Mainak Mookherjee, Man Xu, Tony Yu, Geeth Manthilake, Yanbin Wang   +5 more
wiley   +1 more source

Primordial black holes from axion domain wall collapse

Journal of High Energy Physics
The QCD axion can solve the Strong CP Problem and be the dark matter of our universe. If the PQ symmetry breaking scale associated with the axion is below the inflationary reheating temperature, axion strings and domain walls populate the universe.
David I. Dunsky, Marius Kongsore
doaj   +1 more source

$f(R)$ gravity theories in the Palatini Formalism constrained from strong lensing

, 2009
$f(R)$ gravity, capable of driving the late-time acceleration of the universe, is emerging as a promising alternative to dark energy. Various $f(R)$ gravity models have been intensively tested against probes of the expansion history, including type Ia ...
Amarzguioui, Amendola, Armendariz-Picon, Armendariz-Picon, Astier, Borowiec, Browne, Caldwell, Caldwell, Capozziello, Capozziello, Capozziello, Carroll, Carvalho, Chae, Chae, Chae, Chen, Chen, Chiba, Choi, Cole, Copeland, Da-Ming Chen, Dabrowski, Dave, de Bernardis, Eisenstein, Erickcek, Fay, Hinshaw, Hopkins, Huterer, Im, Inada, Kamenshchik, Keeton, Keeton, Kochanek, Kochanek, Kochanek, Koivisto, Koopmans, Koopmans, Li, Li, Li, Li, Li, Li, Mao, Maoz, Mitchell, Moller, Navarro, Nojiri, Nojiri, Ofek, Oguri, Oguri, Oguri, Oguri, Olmo, Olmo, Page, Perlmutter, Richards, Riess, Riess, Riess, Rix, Rusin, Santos, Sarbu, Seljak, Sotiriou, Sotiriou, Sotiriou, Spergel, Spergel, Tegmark, Tegmark, Vollick, Weinberg, Wu, Wu, Wu, Wu, Wyithe, Xin-Juan Yang, Zhang, Zhu, Zhu   +92 more
core   +3 more sources

The View from the Top: Visual Intrusion as Nuisance in Fearn v Tate Gallery

The Modern Law Review, Volume 87, Issue 3, Page 697-714, May 2024.
In Fearn v Board of Trustees of the Tate Gallery the UK Supreme Court unanimously held that visual intrusions are in principle actionable under the tort of private nuisance. On the facts, a narrow 3:2 majority found that the Tate Modern was liable for the operation of its viewing gallery where the public could see into the claimants’ flats.
Jeevan Hariharan
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

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

Projected Constraints on Modified Gravity Cosmologies from 21 cm Intensity Mapping [PDF]

, 2010
We present projected constraints on modified gravity models from the observational technique known as 21 cm intensity mapping, where cosmic structure is detected without resolving individual galaxies.
Masui, Kiyoshi Wesley, McDonald, Patrick, Pen, Ue-Li, Schmidt, Fabian   +3 more
core   +2 more sources

Effective refractive index tensor for weak field gravity

, 2004
Gravitational lensing in a weak but otherwise arbitrary gravitational field can be described in terms of a 3 x 3 tensor, the "effective refractive index".
Celine Cattoen, Matt Visser, Misner C W, Mollerach S, Novello M, Penrose R Sorkin R D Woolgar E, Petarpa Boonserm, Schneider P, Schutz B F, Sereno M, Silke Weinfurtner, Tristan Faber, Visser M, Visser M, Visser M Bassett B Liberati S Burgess C P Meyers R C   +14 more
core   +3 more sources