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Cosmological perturbations in extended electromagnetism: General gauge invariant approach
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Title: Cosmological perturbations in extended electromagnetism: General gauge invariant approach |
Authors: Dale, Roberto ![](/image/ORCID.jpg) Saéz, Diego |
Editor: American Physical Society |
Department: Departamentos de la UMH::Estadística, Matemáticas e Informática |
Issue Date: 2012-06-21 |
URI: https://hdl.handle.net/11000/30702 |
Abstract:
A certain vector-tensor theory is revisited. It was proposed and analyzed as a theory of electromagnetism
without the standard gauge invariance. Our attention is first focused on a detailed variational
formulation of the theory, which leads to both a modified Lorentz force and the true energy-momentum
tensor of the vector field. The theory is then applied to cosmology. A complete gauge invariant treatment
of the scalar perturbations is presented. For appropriate gauge invariant variables describing the scalar
modes of the vector field (A modes), it is proved that the evolution equations of these modes do not
involve the scalar modes appearing in general relativity (GR modes), which are associated to the metric
and the energy-momentum tensor of the cosmological fluids. However, the A modes modify the standard
gauge invariant equations describing the GR modes. By using the new formalism, the evolution equations
of the A perturbations are derived and separately solved and, then, the correction terms—due to the
A perturbations—appearing in the evolution equations of the GR modes are estimated. The evolution of
these correction terms is studied for an appropriate scale. The relevance of these terms depends on both the
spectra and the values of the normalization constants involved in extended electromagnetism. Further
applications of the new formalism will be presented elsewhere.
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Keywords/Subjects: Cosmological perturbations extended electromagnetism |
Knowledge area: CDU: Generalidades.: Ciencia y tecnología de los ordenadores. Informática. |
Type of document: application/pdf |
Access rights: info:eu-repo/semantics/closedAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional |
DOI: https://doi.org/10.1103/PhysRevD.85.124047 |
Appears in Collections: Artículos Estadística, Matemáticas e Informática
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