Particle physics today faces the challenge of explaining the mystery of dark matter, the origin
of matter over anti-matter in the Universe, the origin of the neutrino masses, the apparent …

This report provides an extensive review of the experimental programme of direct detection
searches of particle dark matter. It focuses mostly on European efforts, both current and …

Black hole superradiance is a powerful probe of light, weakly coupled hidden sector
particles. Many candidate particles, such as axions, generically have self-interactions that …

Two of the most pressing questions in physics are the microscopic nature of the dark matter
that comprises 84% of the mass in the Universe and the absence of a neutron electric dipole …

The axion is a light pseudoscalar particle postulated to solve issues with the Standard
Model, including the strong CP problem and the origin of dark matter. In recent years, there …

A bstract We explore whether the axion which solves the strong CP problem can naturally be
much lighter than the canonical QCD axion. The\({Z} _ {\mathcal {N}}\) symmetry proposed …

Ultralight axion-like particles are well-motivated dark matter candidates introduced by
theories beyond the standard model of particle physics. However, directly constraining their …

We report the results of an experimental search for ultralight axionlike dark matter in the
mass range 162–166 neV. The detection scheme of our Cosmic Axion Spin Precession …

We show that dark matter can be accounted for by an axion that solves the strong CP
problem, but is much lighter than usual due to a Z Script N symmetry. The whole mass range …

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 …