2026-06-28T14:49:44Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/443382023-08-25T12:36:20Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc López Maroto, Antonio author Beltrán Jiménez, José author Koivisto, Tomi S. author Fonseca Mota, David author 2009-10 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 structures 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. 1475-7516 10.1088/1475-7516/2009/10/029 https://hdl.handle.net/20.500.14352/44338 http://dx.doi.org/10.1088/1475-7516/2009/10/029 http://arxiv.org/abs/0907.3648 http://iopscience.iop.org Perturbations in electromagnetic dark energy