Constraints on the Primordial Magnetic Field from $σ_8$

Details Constraints on the Primordial Magnetic Field from $σ_8$ Constraints on the Primordial Magnetic Field from $σ_8$

2008-11-13

arxiv.org/abs/0811.2221v1

Phys.Rev.D78:123001,2008

Astronomy and Astrophysics

Astrophysics

11 pages, 1 figure, accepted for publication as Phys. Rev. D

Scientific paper

10.1103/PhysRevD.78.123001

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 $B_\lambda$ and power spectral index $n_\mathrm{B}$ 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 fluctuations, as parameterized by $\sigma_8$, lead to strong constraints on the amplitude and spectral index of the PMF.

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