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There are some models that postulate the existence of graviphoton. What is the Lagrangian for the interaction of graviphoton with matter?

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  • $\begingroup$ Well, there are two types: the K-K one and the N>1, so extended, supergravity one. They all involve a charge proportional to m/M(Planck). The refs in WP have typical toy Lagrangians... $\endgroup$
    – Cosmas Zachos
    Commented Feb 15 at 15:49

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