ALP inflation and Big Bang on Earth

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We study a hilltop inflation model where an axion-like particle (ALP) plays the role of the inflaton. We find that, for a broad class of potentials, the decay constant and the mass at the potential minimum satisfy the relation, mϕ ∼ 10− 6f, to explain the CMB normalization. The ALP is necessarily coupled to the standard model particles for successful reheating. The ALP with the above relation can be searched at beam dump experiments, e.g., the SHiP experiment, if the inflation scale is sufficiently low. In this case, the ALP decays through the interactions that led to the reheating of the Universe. In other words, the Big Bang may be probed at ground-based experiments.

Original languageEnglish
Article number95
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - 2019 Jul 1


  • Beyond Standard Model
  • Cosmology of Theories beyond the SM
  • Discrete Symmetries
  • Thermal Field Theory


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