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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2585
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dc.contributor.authorNityananda, R.-
dc.date.accessioned2007-06-04T09:06:28Z-
dc.date.available2007-06-04T09:06:28Z-
dc.date.issued1990-
dc.identifier.citationGravitational lensing; Proceedings of the Workshop, Toulouse, France, Sept. 13-15, 1989, Berlin and New York, Springer-Verlag, 1990, p3-12en
dc.identifier.urihttp://hdl.handle.net/2289/2585-
dc.descriptionRestricted Access.en
dc.description.abstractGraphic descriptions of gravitational lensing are presented as a means to elaborate on a historical overview of the field. The time delay with respect to a reference plane, momentum, and gravitational deflection is considered in terms of the geometrical construction of images in lensing based on wavefronts. The seminal works of Fermat, Huyghens, Malus and Hamilton are listed; Refsdal's work (1964) is covered; and special attention is given to Arnold's work on catastrophe theory (1984), Schneider's amplification theorem (1984), and studies by Berry and Upstill (1980). The different approaches to lensing are illustrated for a simple two-dimensional case based on either rays, wavefronts, or phase space, which are then discussed mathematically. The principal directions of curvature are shown for a wavefront passing through a lens, and the behavior of critical lines near an umbilic point is discussed.en
dc.format.extent360002 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherSpringer Verlagen
dc.relation.urihttp://adsabs.harvard.edu/cgi-bin/bib_query?1990LNP...360....3Nen
dc.rights1990 Springer-Verlagen
dc.subjectGEOMETRICAL OPTICSen
dc.subjectGRAVITATIONAL LENSESen
dc.subjectHAMILTONIAN FUNCTIONSen
dc.subjectCOORDINATESen
dc.subjectCURVATUREen
dc.subjectRAY TRACINGen
dc.subjectREFLECTIONen
dc.subjectWAVE FRONTSen
dc.titlePictures of gravitational lensingen
dc.typeArticleen
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