ANISOTROPIES OF THE COSMIC BACKGROUND-RADIATION AND CHARACTERISTIC SCALE OF A CELLULAR-FRACTAL UNIVERSE

We provide detailed calculations of the anisotropies of the microwave background, from the arcminute range to the quadrupole scale, for the cellular-fractal universe introduced in Paper I of this series. Contrary to earlier estimates, we find that the model is consistent with microwave data for a fractal cell radius R less than or similar to 50 h-1 Mpc. The resulting picture also agrees with very recent astronomical observations, including the striking results of Broadhurst et al. (1990), which constitute a hard challenge for standard power-law theories of galaxy formation. We show that the anisotropies in the background radiation should be looked for mainly in the arcminute range, a direct imprint of the cosmic cell radius being predicted around 10'-20'.