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Cosmic acceleration from Abelian symmetry breaking / Gianmassimo Tasinato

Journal of High Energy Physics, Volume: 2014, Issue: 4

Swansea University Author: Gianmassimo Tasinato

Abstract

We discuss a consistent theory for a self-interacting vector field, breaking an Abelian symmetry in such a way to obtain an interesting behavior for its longitudinal polarization. In an appropriate decoupling limit, the dynamics of the longitudinal mode is controlled by Galileon interactions. The fu...

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Published in: Journal of High Energy Physics
ISSN: 1029-8479
Published: 2014
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa21704
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Abstract: We discuss a consistent theory for a self-interacting vector field, breaking an Abelian symmetry in such a way to obtain an interesting behavior for its longitudinal polarization. In an appropriate decoupling limit, the dynamics of the longitudinal mode is controlled by Galileon interactions. The full theory away from the decoupling limit does not propagate ghost modes, and can be investigated in regimes where non-linearities become important. When coupled to gravity, this theory provides a candidate for dark energy, since it admits de Sitter cosmological solutions characterized by a technically natural value for the Hubble parameter. We also consider the homogeneous evolution when, besides the vector, additional matter in the form of perfect fluids is included. We find that the vector can have an important role in characterizing the universe expansion.
College: College of Science
Issue: 4