Searching for dark matter and new physics with nuclear spins

I will describe the results of two new dark matter searches with comagnetometers, and possible avenues for improvement. Comagnetometry is—in absolute energy units—the most sensitive way of measuring the splitting between quantum states, measuring the nuclear spin-up/spin-down splitting at the 1e-26 level. Based purely on existing technology, there is room for several orders of magnitude in further improvement in statistical sensitivity. New physics scenarios that comagnetometers can probe include EDMs, violations of Lorentz invariance, Goldstone bosons from new high-energy symmetries, spin-dependent and CP-violating long-range forces, and axionic dark matter.