Abstract
A primordial magnetic field (PMF) can affect the evolution of density field fluctuations in the early universe. In this paper we constrain the PMF amplitude Band power spectral index nB by comparing calculated density field fluctuations with observational data, i.e. the number density fluctuation of galaxies. We show that the observational constraints on cosmological density fluctu- ations, as parameterized by �8, lead to strong constraints on the amplitude and spectral index of the PMF.
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