This article reviews recent developments in tests of fundamental physics using atoms and
molecules, including the subjects of parity violation, searches for permanent electric dipole …

We review experimental progress on optical atomic clocks and frequency transfer, and
consider the prospects of using these technologies for geodetic measurements. Today …

The present work studies one of Einstein's alternative formulations based on the
nonmetricity scalar Q generalized as f (Q) theory. More specifically, we consider the power …

The combination of optical time transfer and optical clocks opens up the possibility of large-
scale free-space networks that connect both ground-based optical clocks and future space …

Owing to the low-gravity conditions in space, space-borne laboratories enable experiments
with extended free-fall times. Because Bose–Einstein condensates have an extremely low …

The research on cold-atom interferometers gathers a large community of about 50 groups
worldwide both in the academic and now in the industrial sectors. The interest in this sub …

Leveraging the unrivalled performance of optical clocks as key tools for geo-science, for
astronomy and for fundamental physics beyond the standard model requires comparing the …

We report on a new test of the gravitational redshift and thus of local position invariance, an
integral part of the Einstein equivalence principle, which is the foundation of general …

Within the last decade, optical atomic clocks have surpassed the best cesium clocks, which
are used to realize the unit of time and frequency, in terms of accuracy and stability by about …

Precision time references in space are of major importance to satellite-based fundamental
science, global satellite navigation, earth observation, and satellite formation flying. Here we …