# How is matter density derived from CMB?

As the question says. I am looking for a technical but brief overview of how $\Omega_m$ can be derived from the CMB data to high accuracy for example as in the Planck papers.

Thank you

• Last time I searched for this I found nothing brief. The only text book I know of which presents the complete derivation is "Physical foundations of Cosmology" by V. Mukhanov. The chapter on CMB is presented on almost 50 pages and I have too admit that I capitulated when trying too read it (I was at the end of my bachelor studies at that point)... – Photon Dec 5 '17 at 20:37