A Hidden Symmetry of the Galileon

Abstract

We show that there is a special choice of parameters for which the galileon theory is invariant under an enhanced shift symmetry whose non-linear part is quadratic in the coordinates. This symmetry fixes the theory to be equivalent to one with only even powers of the field, with no free coefficients, and accounts for the improved soft limit behavior observed in the quartic galileon S-matrix.

5 pages. v3 typos fixed

References in corpus (10)

• Resummation of Massive Gravity
• Beyond the Cosmological Standard Model
• DBI and the Galileon reunited
• Effective Field Theories from Soft Limits
• Multi-field galileons and higher co-dimension branes
• Symmetries for Galileons and DBI scalars on curved space
• Galileons as Wess-Zumino Terms
• General Embedded Brane Effective Field Theories
• Unification of Galileon Dualities
• Goldstones with Extended Shift Symmetries

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