DISTORTION OF THE ACOUSTIC PEAKS IN THE CMBR DUE TO A PRIMORDIAL MAGNETIC-FIELD

In this paper we study the effect of a magnetic field on the fluctuati on spectrum of the cosmic microwave background. We find that upcoming measurements might give interesting bounds on large scale magnetic fie lds in the early Universe. If the effects are seen, it might be possib le to establish the presence of different fields in different patches of the sky. Absence of any effect, will provide by one order of magnit ude a better limit for a primordial field, now given by nucleosynthesi s.