Massive spin- 5 2 fields coupled to gravity. Tree-level unitarity versus the equivalence principle

Massimo Porrati

    Research output: Contribution to journalArticle


    I show that the gravitational scattering amplitudes of a spin- 5 2 field with mass m<MPl violate tree-level unitarity at energies √s≈√mMPl if the coupling to gravity is minimal. Unitarityup to energies √s≈MPl is restored by adding a suitable non-minimal term, which gives rise to interactions violating the (strong) equivalence principle. These interactions are only relevant at distances d≲1/m.

    Original languageEnglish (US)
    Pages (from-to)77-80
    Number of pages4
    JournalPhysics Letters B
    Issue number1-2
    StatePublished - Apr 22 1993


    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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