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The internal structure of the tetrads in a Poincar\'e non linear gauge theoryof gravity is considered. Minkowskian coordinates becomes dynamical degrees offreedom playing the role of Goldstone bosons of the translations. A criticallength allowing a covariant expansion similar to the weak field approach isdeduced, the zeroth order metric being maximally symmetric (Minkowskian in somecases).

The role of translational invariance in non linear gauge theories of gravity