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Constraints on the Primordial Magnetic Field from σ₈

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arxiv 0811.2221 v1 pith:UFVKIXY6 submitted 2008-11-13 astro-ph gr-qchep-phhep-th

Constraints on the Primordial Magnetic Field from σ₈

classification astro-ph gr-qchep-phhep-th
keywords densityfieldconstraintsfluctuationsamplitudeindexmagneticobservational
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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