We conduct frequency comparisons between a state-of-the-art strontium optical lattice clock,
a cryogenic crystalline silicon cavity, and a hydrogen maser to set new bounds on the …

Numerous astrophysical and cosmological observations are best explained by the existence
of dark matter, a mass density which interacts only very weakly with visible, baryonic matter …

The last decade has seen unprecedented effort in dark matter model building at all mass
scales coupled with the design of numerous new detection strategies. Transformative …

We search for transient variations of the fine structure constant using data from a European
network of fiber-linked optical atomic clocks. By searching for coherent variations in the …

Acceleration measurement is widely used in commercial, scientific, and defense
applications, but the resolution and accuracy achievable for demanding applications is …

A possible implication of an ultralight dark matter field interacting with the standard model
degrees of freedom is oscillations of fundamental constants. Here, we establish direct …

We present a search for fundamental constant oscillations in the range 20 kHz–100 MHz
that may arise within models for ultralight dark matter (UDM). Using two independent optical …

Atom gradiometers have emerged as compelling broadband probes of scalar ultralight dark
matter (ULDM) candidates that oscillate with frequencies between approximately 10-2 Hz …

The effects of scalar and pseudoscalar ultralight bosonic dark matter (UBDM) were searched
for by comparing the frequency of a quartz oscillator to that of a hyperfine-structure transition …

Theories of quantum gravity based on the holographic principle predict the existence of
quantum fluctuations of distance measurements that accumulate and exhibit correlations …