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The total mass density of the Universe appears to be dominated by darkmatter. However, beyond its gravitational interactions at the galactic scale,little is known about its nature. Extensions of the quantum electrodynamicsLagrangian with dark-matter coupling terms may result in changes to StandardModel parameters. Recently, it was proposed that a network of atomic clockscould be used to search for transient signals of a hypothetical dark matter inthe form of stable topological defects. The clocks become desynchronized when adark-matter object sweeps through the network. This pioneering approach, whichis applicable only for distant clocks, is limited by the quality of the fibrelinks. Here, we present an alternative experimental approach that is applicableto both closely spaced and distant optical atomic clocks and benefits fromtheir individual susceptibilities to dark matter, hence not requiring fibrelinks. We explore a new dimension of astrophysical observations by constrainingthe strength of atomic coupling to the hypothetical dark-matter cosmic objects.Our experimental constraint exceeds the previous limits; in fact, it not onlyreaches the ultimate level expected to be achievable with a constellation ofGPS atomic clocks but also has a large potential for improvement.

Searching for topological defect dark matter with optical atomic clocks