On the large-scale anisotropy of the cosmic microwave background

The large-scale temperature fluctuations of the cosmic microwave background (CMB) determined through the Sachs-Wolfe effect by scale-free, adiabatic, and Gaussian density inhomogeneities are discussed. The available observations on the large-scale temperature distribution are compared, taking into account the different experimental settings, and, also, the implications of a recently reported positive detection of CMB anisotropy on the density perturbations spectra index are discussed. 26 references.