Limits for primordial magnetic fields

Details Limits for primordial magnetic fields Limits for primordial magnetic fields

2011-03-21

arxiv.org/abs/1103.4060v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 2 figures. Proceedings of the 25th Texas Symposium, December 2010, Heidelberg (Germany)

Scientific paper

A possible explanation for the origin of the magnetic fields observed today in matter structures is that they were generated in the primordial universe. After briefly revising the model of a primordial stochastic magnetic field and sketching the main features of its time evolution in the primordial plasma, we illustrate the current upper bounds on the magnetic field amplitude and spectral index from Cosmic Microwave Background observations and gravitational wave production. We conclude that a primordial magnetic field generated by a non-causal process such as inflation with a red spectrum seems to be favoured as a seed for the magnetic fields observed today in structures.

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