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A large scale coherent magnetic field: interactions with free streaming particles and limits from the CMB

2011; Institute of Physics; Volume: 2011; Issue: 06 Linguagem: Inglês

10.1088/1475-7516/2011/06/017

1475-7516

Julian Adamek, Ruth Durrer, Elisa Fenu, Marc Vonlanthen,

Black Holes and Theoretical Physics

We study a homogeneous and nearly-isotropic Universe permeated by a homogeneous magnetic field. Together with an isotropic fluid, the homogeneous magnetic field, which is the primary source of anisotropy, leads to a plane-symmetric Bianchi I model of the Universe. However, when free-streaming relativistic particles are present, they generate an anisotropic pressure which counteracts the one from the magnetic field such that the Universe becomes isotropized. We show that due to this effect, the CMB temperature anisotropy from a homogeneous magnetic field is significantly suppressed if the neutrino masses are smaller than 0.3 eV.