Tight coupling expansion and fully inhomogeneous magnetic fields

Details Tight coupling expansion and fully inhomogeneous magnetic fields Tight coupling expansion and fully inhomogeneous magnetic fields

2006-06-30

arxiv.org/abs/astro-ph/0606759v1

Phys.Rev. D74 (2006) 063002

Astronomy and Astrophysics

Astrophysics

30 pages, 14 figures

Scientific paper

10.1103/PhysRevD.74.063002

The tight coupling expansion, appropriately generalized to include large-scale magnetic fields, allows the estimate of the brightness perturbations of CMB anisotropies for typical wavelengths that are larger than the Hubble radius after matter-radiation equality. After discussing the basic features of the the pre-decoupling initial conditions in the presence of fully inhomogeneous magnetic fields, the tight coupling expansion is studied both analytically and numerically. From the requirement that the amplitudes and phases of Sakharov oscillations are (predominantly) adiabatic and from the inferred value of the plateau in the temperature autocorrelation, the effects of the magnetized contribution can be systematically investigated and constrained.

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