On the distance measure for gravitational lenses

Details On the distance measure for gravitational lenses On the distance measure for gravitational lenses

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302...43a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 1, 1986, p. 43-51. Research supported by the Research Corp.

Physics

Optics

22

Big Bang Cosmology, Distance, Geometrical Optics, Gravitational Lenses, Space-Time Functions, Hubble Constant, Quasars, Relativity, Scalars

Scientific paper

A discussion is presented of some of the physical elements that are important for geometric optics in curved space-time, with a view toward interpreting data on gravitational lenses. This is important because each gravitational lens provides geometrical information about an arc that crosses a substantial portion of the universe. The propagation of photons along long arcs is highly sensitive to the mean density in the beam, averaged along the arc. Fluctuations about this mean are not important unless their scale is comparable to that of the universe. Tidal distortion is important if only a few lumps are involved. The variation in the geometrical optics is considerably greater if there is a nonzero cosmological constant.

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