Dissecting Axion and Dark Photon with A Network of Vector Sensors
  We develop formalisms for a network of vector sensors, sensitive to certain
spatial components of the signals, to identify the properties of light axion or
dark photon background. These bosonic fields contribute to vector-like signals
in the detectors, including effective magnetic fields triggering the spin
precession, effective electric currents in a shielded room, and forces on the
matter. The interplay between a pair of vector sensors and a baseline that
separates them can potentially uncover rich information of the bosons,
including angular distribution, polarization modes, source localization, and
macroscopic circular polarization. Using such a network, one can identify the
microscopic nature of a potential signal, such as distinguishing between the
axion-fermion coupling and the dipole couplings with the dark photon.
