宇宙学参数估计与贝叶斯模型比较:基于VSA数据
天体物理学
2009-11-07 v2
摘要
我们利用Very Small Array (VSA) 在扩展配置下的首次观测,结合现有的宇宙微波背景数据和其他宇宙学观测,对基本宇宙学参数进行约束。我们对四种递增复杂性的模型进行宇宙学参数估计。在每种情况下,都认真考虑了先验条件,并计算贝叶斯证据以进行模型选择。我们发现,数据最令人信服的解释是一种不含张量模式的简单平坦Lambda-CDM宇宙学。在这种情况下,仅结合VSA和COBE数据集,可得68%置信区间为:Omega_b h^2=0.034 (+0.007, -0.007),Omega_dm h^2 = 0.18 (+0.06, -0.04),h=0.72 (+0.15,-0.13),n_s=1.07 (+0.06,-0.06)和sigma_8=1.17 (+0.25, -0.20)。我们考虑的最一般模型包括空间曲率、张量模式、质子质量和暗能量参数化方程状态。在这种情况下,通过结合最新的宇宙学数据,我们特别发现95%置信上限为张量-标量比R < 0.63和质子质量比例f_nu < 0.11;我们也获得暗能量方程状态的68%置信区间w=-1.06 (+0.20, -0.25)。
引用
@article{arxiv.astro-ph/0212497,
title = {Cosmological parameter estimation and Bayesian model comparison using VSA data},
author = {Anze Slosar and Pedro Carreira and Kieran Cleary and Rod D. Davies and Richard J. Davis and Clive Dickinson and Ricardo Genova-Santos and Keith Grainge and Carlos M. Gutierrez and Yaser A. Hafez and Michael P. Hobson and Michael E. Jones and Rudiger Kneissl and Katy Lancaster and Anthony Lasenby and J. P. Leahy and Klaus Maisinger and Phil J. Marshall and Guy G. Pooley and Rafael Rebolo and Jose Alberto Rubino-Martin and Ben Rusholme and Richard D. E. Saunders and Richard Savage and Paul F. Scott and Pedro J. Sosa Molina and Angela C. Taylor and David Titterington and Elizabeth Waldram and Robert A. Watson and Althea Wilkinson},
journal= {arXiv preprint arXiv:astro-ph/0212497},
year = {2009}
}
备注
6 pages, 6 figures, version with minor corrections accepted by MNRAS