Volume 471, Number 1, August III 2007
|Page(s)||65 - 70|
|Section||Cosmology (including clusters of galaxies)|
|Published online||12 June 2007|
On using the cosmic microwave background shift parameter in tests of models of dark energy
Institute of theoretical astrophysics, University of Oslo, Box 1029, 0315 Oslo, Norway e-mail: firstname.lastname@example.org
2 Department of Physics, University of Turku, 20014 Turku, Finland e-mail: email@example.com
Accepted: 31 May 2007
Context.The so-called shift parameter is related to the position of the first acoustic peak in the power spectrum of the temperature anisotropies of the cosmic microwave background (CMB). It is an often used quantity in simple tests of dark energy models. However, the shift parameter is not directly measurable from the cosmic microwave background, and its value is usually derived from the data assuming a spatially flat cosmology with dark matter and a cosmological constant.
Aims.To evaluate the effectiveness of the shift parameter as a constraint on dark energy models.
Methods.We discuss the potential pitfalls in using the shift parameter as a test of non-standard dark energy models.
Results.By comparing to full CMB fits, we show that combining the shift parameter with the position of the first acoustic peak in the CMB power spectrum improves the accuracy of the test considerably.
Key words: cosmology: theory / cosmological parameters
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.