Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/127542
Title: | Isocurvature modes and Baryon Acoustic Oscillations |
Author: | Mangilli, Anna Verde, Licia Beltran, Maria |
Keywords: | Cosmologia Astrofísica Cosmology Astrophysics |
Issue Date: | 2010 |
Publisher: | Institute of Physics (IOP) |
Abstract: | The measurement of Baryonic Acoustic Oscillations from galaxy surveys is well known to be a robust and powerful tool to constrain dark energy. This method relies on the knowledge of the size of the acoustic horizon at radiation drag derived from Cosmic Microwave Background Anisotropy measurements. In this paper we quantify the effect of non-standard initial conditions in the form of an isocurvature component on the determination of dark energy parameters from future BAO surveys. In particular, if there is an isocurvature component (at a level still allowed by present data) but it is ignored in the CMB analysis, the sound horizon and cosmological parameters determination is biased, and, as a consequence, future surveys may incorrectly suggest deviations from a cosmological constant. In order to recover an unbiased determination of the sound horizon and dark energy parameters, a component of isocurvature perturbations must be included in the model when analyzing CMB data. Fortunately, doing so does not increase parameter errors significantly. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2010/10/009 |
It is part of: | Journal of Cosmology and Astroparticle Physics, 2010, vol. JCAP10(2010), num. 10, p. 09 |
URI: | http://hdl.handle.net/2445/127542 |
Related resource: | https://doi.org/10.1088/1475-7516/2010/10/009 |
ISSN: | 1475-7516 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Publicacions de projectes de recerca finançats per la UE |
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