Results 51 to 60 of about 165,391 (125)

Shadows and photon spheres in static and rotating traversable wormholes

Nuclear Physics B
We explore the shadows and photon orbits of both static and rotating traversable wormholes by employing a redshift function in combination with two distinct shape functions.
Takol Tangphati, Phongpichit Channuie, Kazuharu Bamba, Davood Momeni   +3 more
doaj  

Gravitational Lensing in More Realistic Dark Matter Halo Models [PDF]

Physics of the Dark Universe (2024)
In this study, we explore gravitational lensing using more realistic dark matter halo models, moving beyond the limitations of spherical-collapse approximations. Through analytical calculations employing various mass functions, we address critical factors often neglected in the standard Press-Schechter formalism, such as ellipsoidal collapse conditions,
arxiv   +1 more source

Non-Gaussian signature of weak gravitational lensing in the CMB [PDF]

arXiv, 1998
Inflationary cosmologies predict Gaussian primordial fluctuations, but subsequent gravitational lensing of the CMB disturbs its Gaussianity. Knowledge of the specific signature of lensing is necessary to distinguish a lensed Gaussian sky from an intrinsically non-Gaussian one. In this paper we investigate the pattern of non-Gaussian features in the CMB
arxiv  

A toolbox for general elliptical gravitational lenses [PDF]

arXiv, 1993
We introduce a formalism to describe 2D-Potentials for 2D-matter (or charge) distributions with arbitrary elliptical symmetry including varying eccentricity and twisting of the iso-density curves. We use this approach to describe elliptical matter distributions such as elliptical galaxies or clusters as gravitational lenses.
arxiv  

A Novel Test for MOND: Gravitational Lensing by Disc Galaxies [PDF]

arXiv
Disc galaxies represent a promising laboratory for the study of gravitational physics, including alternatives to dark matter, owing to the possibility of coupling rotation curves' dynamical data with strong gravitational lensing observations. In particular, Euclid, DES and LSST are predicted to observe hundreds of thousands of gravitational lenses ...
arxiv  

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

86th Annual Meeting of the Meteoritical Society (2024)

Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley   +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

From Modified Newtonian Dynamics to Superfluid Vacuum Theory. [PDF]

Entropy (Basel), 2022
Scott TC.
europepmc   +1 more source