Results 81 to 90 of about 34,012 (161)

Measuring Space-Time Geometry over the Ages

, 2012
Theorists are often told to express things in the "observational plane". One can do this for space-time geometry, considering "visual" observations of matter in our universe by a single observer over time, with no assumptions about isometries, initial ...
ALBERT STEBBINS, Birney D. Scott, Sandage A.   +2 more
core   +2 more sources

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

Primordial Bispectrum Information from CMB Polarization

, 2004
After the precise observations of the Cosmic Microwave Background (CMB) anisotropy power spectrum, attention is now being focused on the higher order statistics of the CMB anisotropies.
D. Babich, Daniel Babich, J. Maldacena, Matias Zaldarriaga, N. Arkani-Hamed, N. Bartolo, P. Creminelli   +6 more
core   +1 more source

Unveiling the Dynamics of the Universe

, 2016
We explore the dynamics and evolution of the Universe at early and late times, focusing on both dark energy and extended gravity models and their astrophysical and cosmological consequences.
Avelino, Pedro, Barreiro, Tiago, Carvalho, C. Sofia, da Silva, Antonio, Lobo, Francisco S. N., Martin-Moruno, Prado, Mimoso, Jose Pedro, Nunes, Nelson J., Rubiera-Garcia, Diego, Saez-Gomez, Diego, Sousa, Lara, Tereno, Ismael, Trindade, Arlindo   +12 more
core   +2 more sources

Constraints on modified gravity from Planck 2015: when the health of your theory makes the difference

, 2016
We use the effective field theory of dark energy (EFT of DE) formalism to constrain dark energy models belonging to the Horndeski class with the recent Planck 2015 CMB data.
Marinoni, Christian, Piazza, Federico, Salvatelli, Valentina   +2 more
core   +3 more sources

Non-parametric inversion of gravitational lensing systems with few images using a multi-objective genetic algorithm

, 2007
Galaxies acting as gravitational lenses are surrounded by, at most, a handful of images. This apparent paucity of information forces one to make the best possible use of what information is available to invert the lens system.
Abdelsalam, Blandford, Bradač, Broadhurst, Charbonneau, Deb, Diego, H. Dejonghe, Holland, J. Liesenborgs, Keeton, Kneib, Kochanek, Koopmans, Koza, Liesenborgs, P. Bekaert, Plummer, S. De Rijcke, Saha, Saha, Schneider, Shamos   +22 more
core   +1 more source

87th Annual Meeting of the Meteoritical Society 2025: Abstracts

Meteoritics &Planetary Science, Volume 60, Issue S1, Page 30-350, August 2025.
wiley   +1 more source

Gravity beyond Einstein? Yes, but in which direction? [PDF]

Philos Trans A Math Phys Eng Sci, 2022
Kazanas D, Papadopoulos D, Christodoulou D.   +2 more
europepmc   +1 more source

Rings of light caused by gravitational waves. [PDF]

Sci Rep, 2022
Batic D, Faraji JM, Nowakowski M, Baracaldo NM.   +3 more
europepmc   +1 more source

Static and stationary dark fluid universes: a gravitoelectromagnetic perspective. [PDF]

Sci Rep, 2022
Nouri-Zonoz M, Nourizonoz A.
europepmc   +1 more source