Cosmic acceleration from Abelian symmetry breaking

By G. Tasinato. 2014

227 citations recorded by the source corpus.

A bstractWe 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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b393ca8d4d934dcb0e782c68ff33986dbce158f9

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Citations in the corpus

Generalization of the Proca Action (2014, background): “in [11] even though the interactions we constructed here are more general.”
Cosmological tests of modified gravity (2015, background): “The galileon interactions can be also extended to vectors [78, 79, 80].”
A systematic approach to generalisations of General Relativity and their cosmological implications (2018, background): “An alternative relatively unexplored route emerges if one explicitly breaks the underlying U(1) symmetry of the vector field and constructs generalisations of the Proca vector field [63, 64, 65, 66].”
Dark Energy in Light of Multi-Messenger Gravitational-Wave Astronomy (2018, background): “Proca theories have been generalized to include explicit gravitational interactions of a massive vector field (Heisenberg, 2014; Tasinato, 2014; Allys et al., 2016a; Beltran Jimenez and Heisenberg, 2016).”
Cosmology in generalized Proca theories (2016, background): “In local regions of the Universe the effect of the mass term is negligible, but the derivative interactions like b4X 2 in G4 play crucial roles to screen the propagation of the fifth force mediated by the vector field [71, 72, 82].”
Generalized Proca action for an Abelian vector field (2015, background): “[8–11]), thereby forming the vector Galileon case [12, 13], which was investigated thoroughly [14–21].”