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Paper   IPM / Astronomy / 13678
School of Astronomy
  Title:   Spontaneous "Scalar-Vector Galileons" from "Weyl bi-Connection" model
  Author(s):  N. Khosravi
  Status:   Published
  Journal: Phys. Rev. D
  Year:  2014
  Supported by:  IPM
Weyl bi-connection model manifests a natural framework to automatically produce the Galileon structure. It is shown that this framework can explain scalar Galileon, vector Galileon as well as their interactions by generalizing the Weyl non-metricity. So it can be interpreted as a geometrical realization for Galileons. The non-metricity part enjoys a U(1) gauge invariance. The result is interestingly non-trivial since the Galileon structure appears spontaneously and not by demanding the absence of the Ostrogradsky ghost. This fact suggests a possible deeper conceptual relation between Weyl bi-connection model and the absence of Ostrogradsky ghost.

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