We study the Hamiltonian formulation of a gravity model obtained from a Yang-Mills theory for a one-parameter family of (anti)de Sitter [(A)dS] Lie algebras parametrized by $\alpha$, when the family of algebras is contracted to the Poincaré algebra in the limit $\alpha \to 0$. We derive the canonical structure and first-class constraints and analyze the resulting algebra in the contraction limit. In this limit, the constraints generate the residual Lorentz gauge invariance, and the components of the AdS potential transform as tetrads and Lorentz connection. Finally, we determine the number of physical degrees of freedom, showing that in the nonpropagating torsion sector—selected by a Lorentz-covariant gauge condition preserved under dynamical evolution—the theory exhibits only 2 propagating degrees of freedom.

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• Gauge theories
• Gravitation