Strong gravitational lensing inf(χ) = χ3/2gravity
نویسندگان
چکیده
منابع مشابه
Strong Gravitational Lensing and Dark Energy Complementarity
In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation between its present value w0 and time variation wa. Quantities that have instead positive correlation and so a sensitivity direction largely orthogo...
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Galactic sized gravitational lenses are simulated by combining a cosmological N-body simulation and models for the baryonic component of the galaxy. The lens caustics, critical curves, image locations and magnification ratios are calculated by ray-shooting on an adaptive grid. It is found that the simulations do not cause the observed number of violations of the cusp caustic magnification relat...
متن کاملGravitational Shear, Flexion and Strong Lensing
We present a gravitational lensing analysis of the galaxy cluster Abell 1689, incorporating measurements of the weak shear, flexion, and strong lensing induced in background galaxies. This is the first time that a shapelet technique has been used to reconstruct the distribution of mass in this cluster, and the first time that a flexion signal has been measured using cluster members as lenses. F...
متن کاملCusp-core problem and strong gravitational lensing
Cosmological numerical simulations of galaxy formation have led to the cuspy density profile of pure cold dark matter halo toward the center, which is in sharp contradiction with the observations of the rotation curves of cold dark matter-dominated dwarf and low surface brightness disk galaxies, the latter tends to favor mass profiles with a flat central core. Many efforts have been devoted to ...
متن کاملStrong gravitational lensing and galactic bulges
Lensing probabilities of quasars with image separations greater than ∆θ and flux density ratios less than qr are calculated by foreground dark matter halos in a flat, cosmological constant dominated (ΛCDM) universe . The mass density of the lenses is taken to be the Navarro-Frenk-White (NFW) profile on all mass scales, plus a central point mass for low-mass halos with M < Mc = 5× 1013h−1M . We ...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2017
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2017/06/057