Strong gravitational lensing and dark energy complementarity

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In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation between its present value w{sub 0} and time variation w{sub a}. Quantities that have instead positive correlation and so a sensitivity direction largely orthogonal to, e.g., distance probes offer the hope of achieving tight constraints through complementarity. Such quantities are found in strong gravitational lensing observations of image separations and time delays. While degeneracy between cosmological parameters prevents full complementarity, strong lensing ... continued below

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Linder, Eric V. January 21, 2004.

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In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation between its present value w{sub 0} and time variation w{sub a}. Quantities that have instead positive correlation and so a sensitivity direction largely orthogonal to, e.g., distance probes offer the hope of achieving tight constraints through complementarity. Such quantities are found in strong gravitational lensing observations of image separations and time delays. While degeneracy between cosmological parameters prevents full complementarity, strong lensing measurements to 1 percent accuracy can improve equation of state characterization by 15-50 percent. Next generation surveys should provide data on roughly 105 lens systems, though systematic errors will remain challenging.

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  • Journal Name: Astrophysics; Journal Volume: 1; Journal Issue: 0401433; Other Information: Journal Publication Date: 01/21/2004

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  • Report No.: LBNL--54533
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 827573
  • Archival Resource Key: ark:/67531/metadc782984

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 21, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 4, 2016, 2:29 p.m.

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Linder, Eric V. Strong gravitational lensing and dark energy complementarity, article, January 21, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc782984/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.