We review the landscape of QCD axion models. Theoretical constructions that extend the
window for the axion mass and couplings beyond conventional regions are highlighted and …

The NANOGrav collaboration has recently observed first evidence of a grav-itational wave
background (GWB) in pulsar timing data. Here we explore the possibility that this GWB is …

An overview of our experimental program to search for axion and axion-like-particle (ALP)
dark matter using nuclear magnetic resonance (NMR) techniques is presented. An …

Searches for axionlike particles (ALPs) are motivated by the strong CP problem in particle
physics and by unexplained dark matter in astrophysics. In this paper, we discuss novel ALP …

Galactic dark matter may consist of axionlike particles (ALPs) that can be described as an
“ultralight bosonic field” oscillating at the ALP Compton frequency. The ALP field can be …

The nature of dark matter remains one of the biggest mysteries of the universe. Extensions to
the Standard Model of particle physics provide potential candidates for dark matter. Such …