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arXiv · 2506.24047

Linearized transverse diffeomorphism invariant spin-2 theories via gauge invariants

D. Dalmazi·Luiz G. M. Ramos
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Abstract

We analyze the particle spectrum of a second-order (in derivatives) theory based on a rank-2 tensor field with both symmetric and antisymmetric components. By demanding the existence of a propagating massless spin-2 particle and invariance under linearized transverse diffeomorphisms, we derive a new class of stable models with two massless scalars and a single massless spin-2 particle. A natural non linear completion is proposed in terms of a dynamical metric field. The identification of the spectrum is carried out using a fully Lagrangian, gauge-invariant approach which makes use of Bardeen variables in a constructive manner. The approach significantly reduces the number of steps in the spectrum determination in some cases.

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D. Dalmazi, Luiz G. M. Ramos. 2025-06-30. Linearized transverse diffeomorphism invariant spin-2 theories via gauge invariants. https://doi.org/10.1088/1361-6382%2Fae5d1b

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