Precise Estimation of Cosmological Parameters Using a More Accurate Likelihood Function
Cosmology and Nongalactic Astrophysics
2010-12-28 v2
Abstract
The estimation of cosmological parameters from a given data set requires a construction of a likelihood function which, in general, has a complicated functional form. We adopt a Gaussian copula and constructed a copula likelihood function for the convergence power spectrum from a weak lensing survey. We show that the parameter estimation based on the Gaussian likelihood erroneously introduces a systematic shift in the confidence region, in particular for a parameter of the dark energy equation of state w. Thus, the copula likelihood should be used in future cosmological observations.
Cite
@article{arxiv.1011.4996,
title = {Precise Estimation of Cosmological Parameters Using a More Accurate Likelihood Function},
author = {Masanori Sato and Kiyotomo Ichiki and Tsutomu T. Takeuchi},
journal= {arXiv preprint arXiv:1011.4996},
year = {2010}
}
Comments
5 pages, 3 figures. Maches version published by the Physical Review Letters