CMB parameter estimation
We have developed a method of massive data compression, reducing 2000 correlated numbers to ~17 uncorrelated numbers.
- CMB analysis typically starts with time-ordered data, proceeds through map construction, to power spectrum (Cl) estimation, to cosmological power spectrum estimation. The step from Cl?cosmological parameters (?0, ?, ?b…) is by no means trivial.
Unsolved problem: Full parameter estimation is not practical (max. likelihood in ~17 dimensions)
Speeds up parameter estimation by up to ? 108 (almost losslessly)