Gravitational wave interactions in Λ3 models of dark energy

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We argue that cubic order interactions between two scalar gravitons and one tensor graviton are ubiquitous in models of dark energy where the strong coupling scale is Λ3. These interactions can potentially provide efficient decay channels for gravitational waves. They can also lead to gradient instabilities of the scalar perturbations in the presence of large amplitude gravitational waves, e.g. those detected by LIGO/Virgo. In contrast with models in scalar-tensor theories, there is an infinite number of higher order interactions in generic Λ3 models, which make it difficult to predict the fate of these instabilities inferred from cubic order interactions.
Original languageEnglish
Article number025
Number of pages22
JournalJournal of Cosmology and Astroparticle Physics
Issue number10
Publication statusPublished - 10 Oct 2022


  • hep-th
  • astro-ph.CO
  • gr-qc
  • UKRI
  • STFC
  • ST/S000550/1
  • ST/W001225/1
  • Cosmological perturbation theory in GR and beyond
  • dark energy theory
  • Gravitational waves in GR and beyond : theory
  • modified gravity


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