Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Linearized supergravity with a dynamical preferred frame   We study supersymmetric extension of the Einstein-aether gravitational model
where local Lorentz invariance is broken down to the subgroup of spatial
rotations by a vacuum expectation value of a timelike vector field called
aether. Embedding aether into a chiral vector superfield, we construct the most
general action which describes dynamics of linear perturbations around the
Lorentz-violating vacuum and is invariant under the linearized supergravity
transformations. The analysis is performed both in the off-shell non-minimal
superfield formulation of supergravity and in the "on-shell" approach invoking
only physical component fields. The resulting model contains a single free
coupling, in addition to the standard supergravity parameters. The spectrum of
physical excitations features an enhanced on-shell gravity multiplet comprising
four states with helicities 2, 3/2, 3/2 and 1 propagating with superluminal
velocity. The remaining excitations propagate with the speed of light. We
outline the observational constraints on the model following from its
low-energy phenomenology.

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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
2
The categories of this paper are: math
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
3
The categories of this paper are: physics