Cosmological parameters from CMB maps without likelihood approximation

Abstract

A primary goal of modern cosmology is to measure cosmological parameters. Given the sensitivity of current and future CMB surveys, the most important systematic effect is due to astrophysical foreground contamination. Here we present a new method that allows for joint estimation of cosmological parameter and the CMB map1. Combining this algorithm with parametric separation of astrophysical components, and thereby marginalizing over physically motivated foreground models, is straightforward, and will be done in future work.