New astrophysical bounds on ultralight axionlike particles

Motivated by tension between the predictions of ordinary cold dark matter (CDM) and observations at galactic scales, ultralight axionlike particles (ULALPs) with mass of the order ${10}^{\ensuremath{-}22}\text{ }\text{ }\mathrm{eV}$ have been proposed as an alternative CDM candidate. We consider col... View More