Physics – Optics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..4cf.v1001i&link_type=abstract
American Physical Society, Four Corners Section Fall Meeting, 15-16 October, 2004, Albuquerque, NM. MEETING ID: 4CF04, abstract
Physics
Optics
Scientific paper
Einstein's masterwork, the General Theory of Relativity, gives us a context for understanding the size, shape and evolution of the universe. In this talk, I will discuss two ways astronomers use quasars as probes of different aspects of Einstein's legacy. When a distant quasar is lensed by an intervening galaxy or a cluster, the image geometry can be used to learn about the mass of the lens, the cosmic distance scale, and the host galaxy of the quasar. Nature has provided a hundred of these experiments in gravitational optics. Close pairs of quasars provide a way to measure the geometry of the intervening space using neutral hydrogen as a tracer. This technique can potentially provide a direct measurement of the effect of the cosmological constant.
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