Revisiting fifth forces in the Galileon model

Details Revisiting fifth forces in the Galileon model Revisiting fifth forces in the Galileon model

2010-05-11

arxiv.org/abs/1005.1927v2

JCAP08(2010)011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages

Scientific paper

10.1088/1475-7516/2010/08/011

A Galileon field is one which obeys a spacetime generalization of the non-relativistic Galilean invariance. Such a field may possess non-canonical kinetic terms, but ghost-free theories with a well-defined Cauchy problem exist, constructed using a finite number of relevant operators. The interactions of this scalar with matter are hidden by the Vainshtein effect, causing the Galileon to become weakly coupled near heavy sources. We revisit estimates of the fifth force mediated by a Galileon field, and show that the parameters of the model are less constrained by experiment than previously supposed.

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