Kerr loop
A Kerr loop was a temporal phenomenon which could be created through the interactions of high-energy discharges with superstring material.

In 2344, a temporal rift which was the formation of a Kerr loop from superstring material, was created through the intense weapons fire in a battle between the  and four Romulan Warbirds at the Klingon outpost at Narendra III. The Enterprise-C was inadvertently responsible for the creation of an alternate timeline when it drifted into the rift and traveled through time. ()

See also
Kerr object
Kerr Newman

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Astronomical phenomena
Time travel