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arXiv · 1906.02727

Soldering spin-3 opposite helicities in $D=2+1$

D. Dalmazi·A. L. R. dos Santos·E. L. Mendonça·R. Schimidt Bittencourt
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Abstract

Here we present the `soldering' of opposite helicity states of a spin-3 particle, in $D=2+1$, into one parity doublet. The starting points may be either the sixth- or the fifth-order (in derivatives) spin-3 self-dual models of opposite helicities. The high number of derivatives avoids the use of auxiliary fields which has been so far an obstacle for a successful soldering procedure. The resulting doublet model is a new Lagrangian with six orders in derivatives and no auxiliary field. It may be regarded as a spin-3 analogue of the linearized `New Massive Gravity'. We check its particle content via a gauge invariant and Lorentz covariant analysis of the analytic structure of the two-point amplitude with the help of spin-3 analogues of the Barnes and Rivers projection operators. The particle content is alternatively confirmed in a specific non-covariant gauge by a decomposition in helicity variables. The soldered model is ghost free and contains two physical states as expected for a parity doublet.

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D. Dalmazi, A. L. R. dos Santos, E. L. Mendonça, R. Schimidt Bittencourt. 2019-09-02. Soldering spin-3 opposite helicities in $D=2+1$. https://doi.org/10.1103/physrevd.100.065011

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