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How higher-spin gravity surpasses the spin-two barrier

Abstract : Aiming at nonexperts, the key mechanisms of higher-spin extensions of ordinary gravities in four dimensions and higher are explained. An overview of various no-go theorems for low-energy scattering of massless particles in flat spacetime is given. In doing so, a connection between the S-matrix and the Lagrangian approaches is made, exhibiting their relative advantages and weaknesses, after which potential loopholes for nontrivial massless dynamics are highlighted. Positive yes-go results for non-Abelian cubic higher-derivative vertices in constantly curved backgrounds are reviewed. Finally, how higher-spin symmetry can be reconciled with the equivalence principle in the presence of a cosmological constant leading to the Fradkin-Vasiliev vertices and Vasiliev's higher-spin gravity with its double perturbative expansion (in terms of numbers of fields and derivatives) is outlined.
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https://hal.archives-ouvertes.fr/hal-00790769
Contributor : Xavier Bekaert <>
Submitted on : Thursday, February 21, 2013 - 9:53:32 AM
Last modification on : Tuesday, February 12, 2019 - 2:30:56 PM

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Xavier Bekaert, Nicolas Boulanger, Per A. Sundell. How higher-spin gravity surpasses the spin-two barrier. Reviews of Modern Physics, American Physical Society, 2012, 84, pp.987-1009. ⟨10.1103/REVMODPHYS.84.987⟩. ⟨hal-00790769⟩

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