CMB temperature anisotropy at large scales induced by a causal primordial magnetic field

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• Camille Bonvin, DAMTP
• Friday 25 February 2011, 13:00-14:00
• Pavilion B Potter Room (B1.19).

If you have a question about this talk, please contact David Kubiznak.

Magnetic fields are ubiquitous in the Universe: they have been observed in galaxies, in clusters of galaxies and also in the inter-cluster medium. However, the origin of these fields is still unclear. One possibility to explain the initial seed magnetic fields is that they originated in the primordial universe. A stochastic background of primordial magnetic fields generated before recombination can leave imprints on the temperature anisotropy of the cosmic microwave background. In this talk I will present an analytical derivation of the CMB temperature anisotropy induced at large scales from a primordial magnetic field. I will discuss the contradictory results presented in the literature regarding this effect. I will show that the leading order term in the CMB spectrum is strongly suppressed due to the presence of free-streaming neutrinos and that consequently the magnetic Sachs Wolfe spectrum from a causal magnetic field behaves as l(l+1)Cl~l^2.

This talk is part of the DAMTP Friday GR Seminar series.

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