Interacting spin-2 fields in the Stückelberg picture

Johannes Noller, James H. C. Scargill, Pedro G. Ferreira

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Abstract

We revisit and extend the `Effective field theory for massive gravitons' constructed by Arkani-Hamed, Georgi and Schwartz in the light of recent progress in constructing ghost-free theories with multiple interacting spin-2 fields. We show that there exist several dual ways of restoring gauge invariance in such multi-gravity theories, find a generalised Fierz-Pauli tuning condition relevant in this context and highlight subtleties in demixing tensor and scalar modes. The generic multi-gravity feature of scalar mixing and its consequences for higher order interactions are discussed. In particular we show how the decoupling limit is qualitatively changed in theories of interacting spin-2 fields. We relate this to dRGT (de Rham, Gabadadze, Tolley) massive gravity, Hassan-Rosen bigravity and the multi-gravity constructions by Hinterbichler and Rosen. As an additional application we show that EBI (Eddington-Born-Infeld) bigravity and higher order generalisations thereof possess ghost-like instabilities.
Original languageEnglish
Article number007
Pages (from-to)1-66
Number of pages66
JournalJournal of Cosmology and Astroparticle Physics
Volume2014
Issue number02
DOIs
Publication statusPublished - 5 Feb 2014

Keywords

  • modified gravity
  • gravity
  • RCUK
  • STFC

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