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Unformatted text preview: Bianchi Identities and Weak Gravitational Lensing Brian Keith, Mentor: Thomas Kling, Department of Physics, Bridgewater State College, Bridgewater, MA 02325 Gravitational lensing is the bending of light rays due to the gravitational attraction of massive objects such as galaxies. Weak gravitational lensing, the distortion of the shapes of light rays, and general relativity, our modern theory of gravity, have had divergent paths. Astronomers who study weak lensing don’t rely on the principles of general relativity but use approximations to understand their observations. However, general relativity can be used as a medium to explain weak lensing and thus provide an ab initio understanding of it. The research was done in the null tetrad and spin coefficient formalism which hinges on the properties of light rays. The Bianchi identities, which come out of the theory of relativity, were found to be the fundamental equations of weak lensing. The ATP program made this summer research possible. Abstract Photo of weak lensing • Yellow blobs are galaxies. • Light is sheared around the main cluster of galaxies....
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This note was uploaded on 07/06/2009 for the course MGT BAM313 taught by Professor Na during the Spring '09 term at 東京大学.
- Spring '09