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We present a minimal Grand Unified Theory model, based on $SU(5)$ gaugesymmetry and a global $U(1)$ Peccei-Quinn symmetry, that predicts the existenceof an ultralight axion dark matter within a narrow mass range of$m_a\in[0.1,\,4.7]\,$neV. This mass window is determined through an interplaybetween gauge coupling unification constraints, partial proton decay lifetimelimits, and the need to reproduce the experimentally observed fermion massspectrum. The entire parameter space of the proposed model will be probedthrough a synergy between several low-energy experiments that look for protondecay (Hyper-Kamiokande), axion dark matter through axion-photon coupling(ABRACADABRA and DMRadio-GUT) and nucleon electric dipole moments (CASPErElectric).

Fully Testable Axion Dark Matter within a Minimal $SU(5)$ GUT