Low-mass bosonic dark matter particles produced after the Big Bang may form an oscillating classical field, which can be sought for in a variety of low-energy laboratory experiments based on spectroscopic, interferometric and magnetometric techniques, as well as in astrophysical phenomena. Dark bosons can also mediate anomalous fifth forces between ordinary-matter particles. Recent...
NEWS-G (New Experiments With Spheres-Gas) is an innovative experiment aiming to shine a light on the dark matter conundrum using a novel gaseous detector, the Spherical Proportional Counter. It uses light noble gases, such as Hydrogen, Helium, and Neon, as targets, to search for Weakly Interacting Massive Particles (WIMPs) down to the sub-GeV/c${}^{2}$ mass region. The first detector of NEWS-G...
Extra dimensions (ED) can provide a useful tool for model-building. In this paper we introduce a single, flat ED extension of the kinetic-mixing/dark photon (DP) portal for dark matter (DM)
interactions with the Standard Model (SM) assuming a compactification `radius' of order $R^{-1}\sim10-1000$ MeV and examine the resulting modifications to and augmentation of the
usual DP...
The QCD axion is a natural consequence to the Peccei-Quinn solution to the Strong-CP problem and also happens to be a natural dark matter candidate. The first run of the Gen 2 campaign with the Axion Dark Matter Experiment (ADMX) has searched for QCD axions with mass in the few ueV range with unprecedented sensitivity. This talk will discuss how cryogenic operating conditions with...
Mr. N. J. Ayres on behalf of the PSI nEDM Collaboration
Axions and axion-like particles (ALPs) are popular dark matter candidates. Ultralight axion and ALP cold dark matter could manifest as a classical-like field, oscillating coherently on a galactic scale. Through their couplings to gluons, this field would induce an oscillation in the measured value of the electric dipole moments of...
Kinetic decoupling of dark matter (DM) typically happens much later than chemical freeze-out. In fact, local thermal equilibrium is an important assumption for the usual relic density calculations based on solving the Boltzmann equation [for its 0-th moment] describing the DM number density. But is this assumption always justified? In this talk I will address this question and discuss the...
We explore the possibility that Dark Matter is the lightest hadron made of two stable color octet Dirac fermions $Q$. The cosmological DM abundance is reproduced for $M_Q\approx 9.5$ TeV, compatibly with direct, indirect and collider searches. Hybrid hadrons, made of $Q$ and of SM quarks and gluons, have large QCD cross sections, and do not reach underground detectors. Their cosmological...
