Published in International Journal of Modern Physics A,
Volume 22, Issue 16-17, pp. 2697-2894 (2007).
Abstract: The aim of these lectures is to introduce some basic problems arising in gravitation and modern cosmology. All along the discussion the guiding theme is provided by the phenomenological and theoretical properties of the Cosmic Microwave Background (CMB). These lectures have been prepared for a regular Phd course of the University of Milan-Bicocca.
The paper is in pdf format.