Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-12-14
Phys.Rev.D78:036010,2008
Physics
High Energy Physics
High Energy Physics - Theory
13 pages; RevTex; v3: clarifications and references added, version accepted for publication in Phys. Rev. D (2008)
Scientific paper
10.1103/PhysRevD.78.036010
We construct actions of higher spin fields interacting with gravity on AdS_5 backgrounds such that the Compton scattering amplitudes of the interaction are tree-level unitary. We then consider higher-spin fields in the Randall-Sundrum scenario. There, in the fermionic case, we construct a tree-level unitary action of higher spin fields interacting with branes and linearised gravity. In the bosonic case we show that this is not in general possible. A tree-level unitary action of bosonic higher spins interacting with linearised gravity and branes is only possible in the following cases: The brane is a pure tension brane and/or Dirichlet boundary conditions are imposed thereby making bosonic higher spin fields invisible to a brane observer. We finally show that higher spins in Randall-Sundrum II braneworlds can only be produced by (decay into) gravitons at trans-Planckian scales. We end by commenting on the possible relevance of higher-spin unparticles as Dark Matter candidates.
Germani Cristiano
Schelpe Arabella
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