A novel way to determine the scale of inflation

Kari Enqvist, Robert J. Hardwick, Tommi Tenkanen, Vincent Vennin, David Wands

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We show that in the Feebly Interacting Massive Particle (FIMP) model of Dark Matter (DM), one may express the inflationary energy scale H* as a function of three otherwise unrelated quantities, the DM isocurvature perturbation amplitude, its mass and its self-coupling constant, independently of the tensor-to-scalar ratio. The FIMP model assumes that there exists a real scalar particle that alone constitutes the DM content of the Universe and couples to the Standard Model via a Higgs portal. We consider carefully the various astrophysical, cosmological and model constraints, accounting also for variations in inflationary dynamics and the reheating history, to derive a robust estimate for H* that is confined to a relatively narrow range. We point out that, within the context of the FIMP DM model, one may thus determine H* reliably even in the absence of observable tensor perturbations.
Original languageEnglish
Article number006
Number of pages25
JournalJournal of Cosmology and Astroparticle Physics
Early online date6 Feb 2018
Publication statusPublished - 6 Feb 2018


  • astro-ph.CO
  • hep-ph
  • RCUK
  • STFC
  • ST/J001546/1
  • ST/N504245/1
  • ST/N000668/1
  • cosmology of theories beyond the SM
  • dark matter theory
  • inflation
  • particle physics - cosmology connection


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