Results 21 to 30 of about 3,386 (168)

THE ANALYSIS OF IMAGES OF A CIRCULAR SOURCE IN N-POINT GRAVITATIONAL LENSES

open access: yesOdessa Astronomical Publications, 2018
Currently, in the field of computer processing, there are difficulties. When processing astrophysical experimental data, the difficulties are connected, on the one hand, with a large amount of information that requires processing, and, on the other hand,
S. D. Bronza   +2 more
doaj   +1 more source

Theory of gravitational lensing on a curved cosmic string

open access: yesEuropean Physical Journal C: Particles and Fields, 2023
It is discussed in detail the complete mathematical model of gravitational lensing on a single cosmic string (CS) of general shape and position with respect to the line of sight.
Igor I. Bulygin   +2 more
doaj   +1 more source

The Effects of Finite Distance on the Gravitational Deflection Angle of Light

open access: yesUniverse, 2019
In order to clarify the effects of the finite distance from a lens object to a light source and a receiver, the gravitational deflection of light has been recently reexamined by using the Gauss−Bonnet (GB) theorem in differential geometry (Ishihara
Toshiaki Ono, Hideki Asada
doaj   +1 more source

MOA-2020-BLG-208Lb: Cool Sub-Saturn-mass Planet within Predicted Desert

open access: yesThe Astronomical Journal, 2023
We analyze the MOA-2020-BLG-208 gravitational microlensing event and present the discovery and characterization of a new planet, MOA-2020-BLG-208Lb, with an estimated sub-Saturn mass.
Greg Olmschenk   +82 more
doaj   +1 more source

Gravitational lens on de Sitter background

open access: yesPhysical Review D, 2022
Gravitational lenses are examined in de-Sitter (dS) background, for which the existence of the dS horizon is taken into account and hyperbolic trigonometry is used together with the hyperbolic angular diameter distance. Spherical trigonometry is used to discuss a gravitational lens in anti-de Sitter (AdS) background.
Keita Takizawa, Hideki Asada
openaire   +2 more sources

The strong gravitational lens finding challenge [PDF]

open access: yesAstronomy & Astrophysics, 2019
Large-scale imaging surveys will increase the number of galaxy-scale strong lensing candidates by maybe three orders of magnitudes beyond the number known today. Finding these rare objects will require picking them out of at least tens of millions of images, and deriving scientific results from them will require quantifying the efficiency and bias of ...
Metcalf, R. Benton   +36 more
openaire   +7 more sources

Euclid Quick Data Release (Q1)

open access: yesAstronomy & Astrophysics
The Euclid mission aims to survey around 14 000 deg2 of extragalactic sky, providing around 105 gravitational lens images. Modelling of gravitational lenses is fundamental to estimate the total mass of the lens galaxy, along with its dark matter content.
Busillo V.   +313 more
doaj   +1 more source

Exoplanet Searches by Future Deep Space Missions

open access: yesEPJ Web of Conferences, 2011
The search for exoplanets could benefit from gravitational lensing if we could get to 550 AU from the Sun and beyond. This is because the gravitational lens of the Sun would highly intensify there any weak electromagnetic wave reaching the solar system ...
Maccone C.
doaj   +1 more source

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

open access: yesAdvanced Photonics Research
The celebrated theory of general relativity has inspired research on optical simulations using artificial microstructures to mimic curved space–times.
Jun‐Liang Duan   +5 more
doaj   +1 more source

Gravitational Lens Time Delays Using Polarization Monitoring

open access: yesGalaxies, 2017
Gravitational lens time delays provide a means of measuring the expansion of the Universe at high redshift (and therefore in the ‘Hubble flow’) that is independent of local calibrations.
Andrew Biggs, Ian Browne
doaj   +1 more source

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