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

Massimo Porrati

    Research output: Contribution to journalArticle

    Abstract

    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, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume304
    Issue number1-2
    DOIs
    StatePublished - Apr 22 1993

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    equivalence
    gravitation
    scattering amplitude
    interactions
    energy

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

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    abstract = "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.",
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    N2 - 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.

    AB - 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.

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