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We study a hilltop inflation model where an axion-like particle (ALP) playsthe role of the inflaton. We find that, for a broad class of potentials, thedecay constant and the mass at the potential minimum satisfy the relation,$m_\phi \sim 10^{-6} f$, to explain the CMB normalization. The ALP isnecessarily 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 theUniverse. In other words, the Big Bang may be probed at ground-basedexperiments.

ALP inflation and Big Bang on Earth