Perturbations in electromagnetic dark energy

Details Perturbations in electromagnetic dark energy Perturbations in electromagnetic dark energy

2009-07-21

arxiv.org/abs/0907.3648v2

JCAP 0910:029,2009

Physics

General Physics

12 pages, 3 figures. Added new comments to match the published version

Scientific paper

10.1088/1475-7516/2009/10/029

It has been recently proposed that the presence of a temporal electromagnetic field on cosmological scales could explain the phase of accelerated expansion that the universe is currently undergoing. The field contributes as a cosmological constant and therefore, the homogeneous cosmology produced by such a model is exactly the same as that of $\Lambda$CDM. However, unlike a cosmological constant term, electromagnetic fields can acquire perturbations which in principle could affect CMB anisotropies and structure formation. In this work, we study the evolution of inhomogeneous scalar perturbations in this model. We show that provided the initial electromagnetic fluctuations generated during inflation are small, the model is perfectly compatible with both CMB and large scale structure observations at the same level of accuracy as $\Lambda$CDM.

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