Novel Probes of Ultra-Low-Mass Bosonic Dark Matter

I present a brief overview of some novel detection strategies for ultra-low-mass bosonic dark matter that forms a coherently oscillating classical field. Possible effects of such dark-matter fields include time-varying fundamental constants and time-varying spin-precession effects. These effects can be sought with a diverse variety of precision, low-energy (and often) table-top experiments, including: spectroscopy (clock) and optical cavity measurements, laser interferometers, atom interferometers, fifth-force (torsion pendula) experiments, magnetic resonance techniques, and Big Bang nucleosynthesis. Existing and new experimental and observational data have allowed us and other groups to improve on previous observational bounds on possible non-gravitational dark-matter interactions by many orders of magnitude.