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

Massimo Porrati

doi:10.1016/0370-2693(93)91403-A

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

Massimo Porrati

Research output: Contribution to journal › Article › peer-review

Abstract

I show that the gravitational scattering amplitudes of a spin- 5 2 field with mass m<M_Pl violate tree-level unitarity at energies √s≈√mM_Pl if the coupling to gravity is minimal. Unitarityup to energies √s≈M_Pl 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 language	English (US)
Pages (from-to)	77-80
Number of pages	4
Journal	Physics Letters B
Volume	304
Issue number	1-2
DOIs	https://doi.org/10.1016/0370-2693(93)91403-A
State	Published - Apr 22 1993

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/0370-2693(93)91403-A

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

abstract = "I show that the gravitational scattering amplitudes of a spin- 5 2 field with mass 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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AB - I show that the gravitational scattering amplitudes of a spin- 5 2 field with mass 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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Massive spin- 5 2 fields coupled to gravity. Tree-level unitarity versus the equivalence principle

Abstract

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