TY - JOUR
T1 - Massive spin- 5 2 fields coupled to gravity. Tree-level unitarity versus the equivalence principle
AU - Porrati, Massimo
PY - 1993/4/22
Y1 - 1993/4/22
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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U2 - 10.1016/0370-2693(93)91403-A
DO - 10.1016/0370-2693(93)91403-A
M3 - Article
AN - SCOPUS:0002557557
SN - 0370-2693
VL - 304
SP - 77
EP - 80
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -