Large-scale magnetic fields, curvature fluctuations and the thermal history of the Universe

Details Large-scale magnetic fields, curvature fluctuations and the thermal history of the Universe Large-scale magnetic fields, curvature fluctuations and the thermal history of the Universe

2007-07-05

arxiv.org/abs/0707.0857v1

Phys.Rev.D76:103508,2007

Astronomy and Astrophysics

Astrophysics

21 pages, 6 included figures

Scientific paper

10.1103/PhysRevD.76.103508

It is shown that gravitating magnetic fields affect the evolution of curvature perturbations in a way that is reminiscent of a pristine non-adiabatic pressure fluctuation. The gauge-invariant evolution of curvature perturbations is used to constrain the magnetic power spectrum. Depending on the essential features of the thermodynamic history of the Universe, the explicit derivation of the bound is modified. The theoretical uncertainty in the constraints on the magnetic energy spectrum is assessed by comparing the results obtained in the case of the conventional thermal history with the estimates stemming from less conventional (but phenomenologically allowed) post-inflationary evolutions.

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