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It is shown that small-scale magnetic fields present before recombination induce baryonic density inhomogeneities of appreciable magnitude.
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All cited length scales and magnetic field strengths in this paper are comoving, i.e. the values they would have at the present epoch are given
Cited in the paper.
Due to efficient CMBR cooling the effective speed of sound is that for an isothermal baryon gas
Cited in the paper.
In fact, the nonlinearity in C C is only very mild since C C may be well approximated by C ≈ Λ / ( Λ + β e ) C\approx\Lambda/(\Lambda+\beta_{e}) signifying that double photon decay is about one order of magnitude more important than Lyman- α \alpha transitions in producing neutral hydrogen in the ground state
Cited in the paper.
Though the Lyman- α \alpha photon mean free path is coincidentally of the order of ∼ 1 \sim 1 kpc, i.e. different dense regions are not completely decoupled from each other, the “independent region” approximation is very good since hydrogen formation by Lyman- α \alpha transitions is subdominate (cf. [ 14 ] )
Cited in the paper.
There are no other plausible candidats for re-creating small-scale inhomogeneity after Silk damping which is volume filling and of magnitude δ ρ / ρ ∼ 1 \delta\rho/\rho\sim 1 known to the authors
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K. Jedamzik and G. Sigl, Phys. Rev. D 83
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