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 …

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 …

Axions are hypothetical particles that may explain the observed dark matter density and the
non-observation of a neutron electric dipole moment. An increasing number of axion …

The dark photon is a massive hypothetical particle that interacts with the Standard Model by
kinetically mixing with the visible photon. For small values of the mixing parameter, dark …

In the late 1970s, the axion was proposed as a solution to the strong CP problem, ie, the
puzzle why the strong interactions conserve parity P and the product CP of charge …

We study the contribution to the QCD axion dark matter abundance that is produced by
string defects during the so-called scaling regime. Clear evidence of scaling violations is …

The quantum chromodynamics (QCD) axion may modify the cooling rates of neutron stars
(NSs). The axions are produced within the NS cores from nucleon bremsstrahlung and …

The standard model axion seesaw Higgs portal inflation (SMASH) model is a well-motivated,
self-contained description of particle physics that predicts axion dark matter particles to exist …

Axions are some of the best motivated particles beyond the Standard Model. We show how
the attractive self-interactions of dark matter (DM) axions over a broad range of masses, from …