How many dark energy parameters?

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For exploring the physics behind the accelerating universe a crucial question is how much we can learn about the dynamics through next generation cosmological experiments. For example, in defining the dark energy behavior through an effective equation of state, how many parameters can we realistically expect to tightly constrain? Through both general and specific examples (including new parametrizations and principal component analysis) we argue that the answer is 42 - no, wait, two. Cosmological parameter analyses involving a measure of the equation of state value at some epoch (e.g., w_0) and a measure of the change in equation of state ... continued below

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Linder, Eric V. & Huterer, Dragan May 16, 2005.

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For exploring the physics behind the accelerating universe a crucial question is how much we can learn about the dynamics through next generation cosmological experiments. For example, in defining the dark energy behavior through an effective equation of state, how many parameters can we realistically expect to tightly constrain? Through both general and specific examples (including new parametrizations and principal component analysis) we argue that the answer is 42 - no, wait, two. Cosmological parameter analyses involving a measure of the equation of state value at some epoch (e.g., w_0) and a measure of the change in equation of state (e.g., w') are therefore realistic in projecting dark energy parameter constraints. More elaborate parametrizations could have some uses (e.g., testing for bias or comparison with model features), but do not lead to accurately measured dark energy parameters.

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  • Journal Name: Physical Review D; Related Information: Journal Publication Date: 11 August 2005

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  • Report No.: LBNL-58258
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1103/PhysRevD.72.043509 | External Link
  • Office of Scientific & Technical Information Report Number: 964015
  • Archival Resource Key: ark:/67531/metadc933279

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  • May 16, 2005

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 3:50 p.m.

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Linder, Eric V. & Huterer, Dragan. How many dark energy parameters?, article, May 16, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc933279/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.