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We discuss how grand unification can be probed with experiments at lowenergies using quantum sensors. Specifically, we show that scalar multipletscoupled to the gauge sector of a grand unified theory provide a mechanism for atime-varying unified coupling which has low-energy consequences which can beprobed with quantum sensors. We then assume that the multiplets represent ultralight dark matter. Constraints on ultra light dark matter couplings to regularmatter are extracted using atomic clock comparisons, pulsar timing arrays(NANOGrav) and MICROSCOPE.

Probing Grand Unification with Quantum Sensors