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A novel way to determine the scale of inflation

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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


  • 1711.07344v2

    Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in JCAP. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at:

    Accepted author manuscript (Post-print), 2.22 MB, PDF document

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