Gravitational lensing images
[DOCX File]Research Final Report.docx
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Gravitational lensing is a directly observable effect of general relativity. Relativity predicts that the presence of mass causes light beams to bend. This manifests in a couple different ways, but the most dramatic of which is strong lensing.
[DOC File]Worksheet 1 - Perimeter Institute for Theoretical Physics
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The mass found by gravitational lensing agrees with the amount of mass found by: a) orbital method b) brightness method c) both methods d) neither method. 7. There are ordinary astronomical objects that are difficult to see and could produce some of the same effects as Dark Matter. However, the missing matter can’t be made of:
[DOC File]General relativity
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In some cases a complete ring of images has been observed. The focal lengths of gravitational lenses are about 1025 m or a billion light years. Flat and curved space. The idea that light is bent due to gravitational attraction near a massive body can be looked at in another way.
[DOC File]Scott Schlef
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Gravitational lensing in a phenomenon that occurs when light’s path from a source to an observer is bent around a massive object or group of objects such as a star, galaxy, or group of galaxies, due to the general relativistic warping of space-time near those objects.
[DOC File]THE NATURE OF GRAVITATION
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Einstein's General Theory of Relativity was the first to predict the phenomena of gravitational lensing, which have since been actually observed with Hubble telescope and otherwise. It however, unrealistically postulates that the gravitational field exists and produces a curvature in the non-existent spacetime continuum.
[DOC File][Embargoed until 12:45 p - Arizona State University
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In fact, Yan and his colleagues began this work in order to understand why so many of the faraway galaxies they observed in HUDF survey images appear to be located near the line of sight to galaxies in the foreground. Through a statistical analysis, they determined that strong gravitational lensing is the most likely explanation.
[DOC File]Hubble – the DVD
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The gravitational lensing results in multiple images of the original galaxy, many with a characteristically distorted, banana-like shape. Since the amount of lensing depends on the total mass of the cluster, gravitational lensing can be used to ‘weigh’ clusters.
[DOC File]بسمه تعالی - Sharif
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Here, we present the explicit ray-tracing equations, and through numerical integration show that the images of gravitational lensing due to a spherical blackhole in the Einstein’s isotropic medium and Schwarzchild’s anisotropic medium look …
[DOC File]Astronomy at the University of Texas at Austin
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Finally, can even estimate the amount of unseen matter needed to produce the distorted images of galaxy clusters (25.29) by gravitational lensing (25.27, 25.28). Again, need large amounts of unseen matter everywhere. Some regard this as the only direct detection . of dark matter (see the “dark matter maps” in 25.30 and 25.31)
[DOC File]www.astro.caltech.edu
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The earlier cited reviews give a useful pedagogical introduction to the physics of gravitational lensing including how, for example, multiple images are formed. Rather than reproduce the mathematics, I will attempt to illustrate the three basic modes of lensing …
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