Cosmic acceleration from Abelian symmetry breaking

A bstract 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 interactio...

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Bibliographic Details
Published in:The journal of high energy physics 2014-04, Vol.2014 (4), p.1-13, Article 67
Main Author: Tasinato, Gianmassimo
Format: Article
Language:English
Subjects:
Acceleration
Broken symmetry
Classical and Quantum Gravitation
Decoupling
Elementary Particles
Gravitation
High energy physics
Mathematical analysis
Nonlinear dynamics
Nonlinearity
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Relativity Theory
String Theory
Vectors (mathematics)
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Summary:A bstract 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.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP04(2014)067