Cosmic acceleration from Abelian symmetry breaking

Gianmassimo Tasinato*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number067
JournalJournal of High Energy Physics
Issue number4
Publication statusPublished - 2014


  • classical theories of gravity
  • cosmology of theories beyond the SM
  • gauge symmetry


Dive into the research topics of 'Cosmic acceleration from Abelian symmetry breaking'. Together they form a unique fingerprint.

Cite this