Biased Cosmology: Pivots, Parameters, and Figures of Merit

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In the quest for precision cosmology, one must ensure that the cosmology is accurate as well. We discuss figures of merit for determining from observations whether the dark energy is a cosmological constant or dynamical, with special attention to the best determined equation of state value, at the ``pivot'' or decorrelation redshift. We show this is not necessarily the best lever on testing consistency with the cosmological constant, and moreover is subject to bias. The standard parametrization of w(a)=w_0+w_a(1-a) by contrast is quite robust, as tested by extensions to higher order parametrizations and modified gravity. Combination of complementary probes gives ... continued below

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Linder, Eric V. June 19, 2006.

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In the quest for precision cosmology, one must ensure that the cosmology is accurate as well. We discuss figures of merit for determining from observations whether the dark energy is a cosmological constant or dynamical, with special attention to the best determined equation of state value, at the ``pivot'' or decorrelation redshift. We show this is not necessarily the best lever on testing consistency with the cosmological constant, and moreover is subject to bias. The standard parametrization of w(a)=w_0+w_a(1-a) by contrast is quite robust, as tested by extensions to higher order parametrizations and modified gravity. Combination of complementary probes gives strong immunization against inaccurate, but precise, cosmology.

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  • Journal Name: Astroparticle Physics; Related Information: Journal Publication Date: 21 June 2006

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  • Report No.: LBNL-61877
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1016/j.astropartphys.2006.05.004 | External Link
  • Office of Scientific & Technical Information Report Number: 962962
  • Archival Resource Key: ark:/67531/metadc929730

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  • June 19, 2006

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 2:19 p.m.

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Linder, Eric V. Biased Cosmology: Pivots, Parameters, and Figures of Merit, article, June 19, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc929730/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.