Can dark matter interact with photons and influence atomic structure? A case for optical atomic clocks: Two different types of such clocks were compared at the Physikalisch-Technische Bundesanstalt (PTB) within the scope of the Collaborative Research Center DQ-mat and the Cluster of Excellence QuantumFrontiers. It is the most accurate search for an interaction of ultralight dark matter with photons to date.
Click here for original story, Investigating dark matter interactions using optical atomic clocks
Source: Phys.org