Comments on Galileons

Details Comments on Galileons Comments on Galileons

2011-02-08

arxiv.org/abs/1102.1594v2

J.Phys.A44:305201,2011

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, no figures

Scientific paper

10.1088/1751-8113/44/30/305201

The recent progress in the study of Galileons, i.e. equations of second order with an action invariant under a Galilean transformation is related to work on `Universal Field Equations' \cite{dbfgov} which are second order equations arising by an iterative procedure from arbitrary Lagrangians of weight one in their first derivatives. It is pointed out that the Galileon is simply a Kaluza-Klein reduction of a Universal Field Equation. An implicit solution to the equation of motion is presented, and a class of explicit solutions pointed out. The multi-field extensions of both types of equations are derived from a first order formalism, which is simply the substantive derivative of fluid dynamics.

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