HIGHLIGHTS
SUMMARY
The latter considered a scalar triplet of A4, showing that no low-energy physical effects can stem from the A4 invariant quadratic in the scalar fields, and instead the first relevant invariant is cubic. One general question to also be addressed here is how to naturally obtain very high dimensionality for the first discrete-symmetry scalar invariants, that is, how to obtain even further suppressed DGB masses. For the purely derivative terms, NDA suggests coefficients L̂α ~ O(1) or slightly smaller, related to the customary Li above by powers of 4π, e_g L̂1 . . .
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