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

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

2011-02-25

arxiv.org/abs/1102.5235v1

JCAP06(2011)017

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

20 pages, 5 figures (JHEP style) - submitted to JCAP

Scientific paper

10.1088/1475-7516/2011/06/017

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 the neutrino masses are smaller than 0.3 eV.

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