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The Slow Gravitino

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arxiv 1407.8321 v1 pith:4L4PPPAN submitted 2014-07-31 hep-ph hep-th

classification hep-phhep-th
keywords gravitinolorentzequationsspeedspinsymmetryanalysebackground
verification ladder T0 review T1 audit T2 compute T3 formal
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When the supersymmetry breaking sector is a fluid background, Lorentz invariance is broken spontaneously. The super-Higgs mechanism leads to a gravitino Lagrangian with Lorentz symmetry violating terms. We analyse the resulting field equations and constraints. We identify the physical spin 3/2 and spin 1/2 helicity states, derive their equations of motion and construct the propagator. The violation of Lorentz symmetry implies that the longitudinal mode has a non-relativistic dispersion relation, whose speed is lower than the speed of light. We briefly comment on possible implications to gravitino cosmology and phenomenology.

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    Consistency criteria for constrained superfields, a gravitino energy and particle-production puzzle, the unique leading-order massive spin-2 to supergravity coupling, and a twisted Scherk-Schwarz orientifold with full...

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