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Effective Goldstone dynamics on cosmological spacetimes

Marc Schneider*

  • *Contact author: marc.schneider@ehu.eus
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Phys. Rev. D 114, 025004 – Published 6 July, 2026

DOI: https://doi.org/10.1103/brs1-x1dz

Abstract

We derive the Lehmann-Symanzik-Zimmermann reduction formalism for a massive spin-2 particle on Minkowski spacetime and extend the formalism to cosmological spacetimes. The reduction formalism allows for a versatile proof that the Goldstone boson equivalence theorem holds in Friedmann-Lemaître-Robertson-Walker spacetimes. For the de Sitter and the radiation-filled universe, we investigate the Goldstone dynamics and perform an analysis of the range of validity provided by the effective kinetic operator.

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Phys. Rev. D 114, 025004– Published 6 July, 2026
  • Received 1 May 2026
  • Accepted 15 June 2026
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