Journal Article

Precision cosmology with voids: definition, methods, dynamics

Guilhem Lavaux and Benjamin D. Wandelt

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 403, issue 3, pages 1392-1408
Published in print April 2010 | ISSN: 0035-8711
Published online April 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16197.x
Precision cosmology with voids: definition, methods, dynamics

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We propose a new definition of cosmic voids based on methods of Lagrangian orbit reconstruction as well as an algorithm to find them in actual data called DynamIcal Void Analysis. Our technique is intended to yield results which can be modelled sufficiently accurately to create a new probe of precision cosmology. We then develop an analytical model of the ellipticity of voids found by our method based on the Zel'dovich approximation. We measure in N-body simulation that this model is precise at the ∼0.1 per cent level for the mean ellipticity of voids of size greater than ∼4 h−1 Mpc. We estimate that at this scale we are able to predict the ellipticity with an accuracy of σɛ∼ 0.02. Finally, we compare the distribution of void shapes in N-body simulation for two different equations of state w of the dark energy. We conclude that our method is far more accurate than Eulerian methods and is therefore promising as a precision probe of dark energy phenomenology.

Keywords: methods: N-body simulations; methods: statistical; cosmological parameters; dark matter; large-scale structure of Universe

Journal Article.  13117 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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