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The Polaron is the quantum of a "Polarization" field originated by the"contact" interaction [D1][D2] of a massive polarizable particle with a photon.We prove that this process produces bound states. Each bound state carries arepresentation of the photon field that is inequivalent to the Fockrepresentation; we call them "Nelson Polarons". To describe mathematically thecontact interaction we make use of Gamma convergence, a variational tool.

Contac interactions, Gamma convergence in Electrodynamics and the (Nelson) Polaron