A self-contained guide to the CMB Gibbs sampler
Abstract
We present a consistent self-contained and pedagogical review of the CMB Gibbs sampler, focusing on computational methods and code design. We provide an easy-to-use CMB Gibbs sampler named SLAVE developed in C++ using object-oriented design. While discussing why the need for a Gibbs sampler is evident and what the Gibbs sampler can be used for in a cosmological context, we review in detail the analytical expressions for the conditional probability densities and discuss the problems of galactic foreground removal and anisotropic noise. Having demonstrated that SLAVE is a working, usable CMB Gibbs sampler, we present the algorithm for white noise level estimation. We then give a short guide on operating SLAVE before introducing the post-processing utilities for obtaining the best-fit power spectrum using the Blackwell-Rao estimator.
Cite
@article{arxiv.0905.3823,
title = {A self-contained guide to the CMB Gibbs sampler},
author = {Nicolaas E. Groeneboom},
journal= {arXiv preprint arXiv:0905.3823},
year = {2009}
}
Comments
11 pages,