Inconsistencies of Massive Charged Gravitating Higher Spins

Details Inconsistencies of Massive Charged Gravitating Higher Spins Inconsistencies of Massive Charged Gravitating Higher Spins

2001-12-19

arxiv.org/abs/hep-th/0112182v1

Nucl.Phys.B631:369-387,2002

Physics

High Energy Physics

High Energy Physics - Theory

25 pages, latex

Scientific paper

10.1016/S0550-3213(02)00199-2

We examine the causality and degrees of freedom (DoF) problems encountered by charged, gravitating, massive higher spin fields. For spin s=3/2, making the metric dynamical yields improved causality bounds. These involve only the mass, the product eM_P of the charge and Planck mass and the cosmological constant \Lambda. The bounds are themselves related to a gauge invariance of the timelike component of the field equation at the onset of acausality. While propagation is causal in arbitrary E/M backgrounds, the allowed mass ranges of parameters are of Planck order. Generically, interacting spins s>3/2 are subject to DoF violations as well as to acausality; the former must be overcome before analysis of the latter can even begin. Here we review both difficulties for charged s=2 and show that while a g-factor of 1/2 solves the DoF problem, acausality persists for any g. Separately we establish that no s=2 theory --DoF preserving or otherwise -- can be tree unitary.

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