Conveners
Precision Measurements and Fundamental Physics II
- Franklyn Quinlan (National Institute of Standards and Technology)
Background ultralight scalar fields that are considered as a viable candidate for galactic dark matter may manifest themselves in apparent variation of fundamental constants, see, for example, [1,2].
In this talk, we will discuss some of the recent work of our group and collaborators, for example [3- 6], where we search for oscillating dark matter with Compton frequencies from near DC up to...
We report on results from long-term operation of the Yb1 ion optical clock of PTB, where we have obtained uptimes exceeding 80% over typical TAI reporting intervals of 30 days. Using these data and the special electronic structure of Yb+ allows us to improve searches for a coupling of ultra-light dark matter (UDM) to photons, temporal drifts of the fine structure constant and its potential...
Cadmium is attractive for optical lattice clocks and for searches for Dark Matter and beyond-Standard-Model physics via isotope shift measurements. The cadmium clock transition has a small sensitivity to blackbody radiation and it has 8 stable isotopes, 6 spin 0 bosonic isotopes, and 2 spin ½ fermionic isotopes. Without using 229 nm light to drive the singlet transition, we capture thermal Cd...
The paper highlights the importance of the time unit definition,by means of the atomic Cs frequency standard, in the definition of the base units of the International System of units (SI).
