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 …

We report an optical lattice clock with a total systematic uncertainty of 8.1× 10-19 in fractional
frequency units, representing the lowest uncertainty of any clock to date. The clock relies on …

The Scalar Field Dark Matter model has been known in various ways throughout its history;
Fuzzy, BEC, Wave, Ultralight, Axion-like Dark Matter, etc. All of them consist in proposing …

We present a new framework to study the time variation of fundamental constants in a model-
independent way. Model independence implies more free parameters than assumed in …

Our current best guess for a unified theory of gravitation and quantum field theory (string
theory) generically predicts a set of requirements for a consistently quantized theory, the …

We initiate the exploration of the cosmology of dark fifth forces: new forces acting solely on
Dark Matter. We focus on long range interactions which lead to an effective violation of the …

The axion-gluon coupling is the defining feature of the QCD axion. This feature induces
additional and qualitatively different interactions of the axion with standard model particles …

Divalent atoms and ions with a singlet S ground state and triplet P excited state form the
basis of many high-precision optical atomic clocks. Along with the metastable P 0 3 clock …

We show that the QCD axion couples to the electromagnetic kinetic term at one loop. The
result is that if axions make up dark matter, they induce temporal variation of the fine …

Cosmological observables are particularly sensitive to key ratios of energy densities and
rates, both today and at earlier epochs of the Universe. Well-known examples include the …