<< CosmoPlMeeting2006 - CosmoPlMeeting2006Program

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COSMO-PL SPRING MEETING 2006

Strong lensing systems as a probe of Dark Energy in the Universe

I will show how to use an Einstein cross gravitational lensing system HST 14176+5226 to confront its measured characteristics with background cosmologies invoked in the context of dark energy.

The image separations in the system depend on angular distances to the lens and to the source, which in turn are determined by background cosmology. This opens a possibility to constrain cosmological model provided that we have good knowledge of the lens model. Recent measurements of velocity dispersion in the lensing galaxy made by Subaru telescope seem to be consistent with independently obtained bounds on parameters of cosmological models considered.

The method described is based on angular diameter distances and could become a valuable tool of cosmological model inference complementary to Hubble diagram technique based on luminosity distance.

-- MarekBiesiada - 20 Apr 2006