PIRSA:14040132 Scientific Series Cosmology

DOI10.48660/14040132

Series: Cosmology and Gravitation

Trevisan, G. (2014). Galileon Maps: Inequivalent Coset Constructions for Spacetime Symmetries. Perimeter Institute. https://pirsa.org/14040132

Trevisan, Gabirele. Galileon Maps: Inequivalent Coset Constructions for Spacetime Symmetries. Perimeter Institute, Apr. 29, 2014, https://pirsa.org/14040132 

@misc{ pirsa_PIRSA:14040132,
  doi = {10.48660/14040132},
  url = {https://pirsa.org/14040132},
  author = {Trevisan, Gabirele},
  keywords = {Cosmology},
  language = {en},
  title = {Galileon Maps: Inequivalent Coset Constructions for Spacetime Symmetries},
  publisher = {Perimeter Institute},
  year = {2014},
  month = {apr},
  note = {PIRSA:14040132 see, \url{https://pirsa.org}}
}

Abstract

Non-linear realizations of spacetime symmetries can be obtained by a generalization of the coset construction valid for internal ones. The physical equivalence of different representations for spacetime symmetries is not obvious, since their relation involves not only a redefinition of the fields but also a field-dependent change of coordinates. A simple and relevant spacetime symmetry is obtained by the contraction of the 4D conformal group that leads to the Galileon group. In this talk I will analyze two non-linear realizations of this group, focusing in particular on the propagation of signals around non-trivial backgrounds.

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