Mallett’s vision for a time machine centers on what he calls “an intense and continuous rotating beam of light” to manipulate gravity. His device would use a ring of lasers to mimic the spacetime-distorting effects of a black hole.
Can only go back to when you started operating the device. So, basically the Primer time machine, except the math says it has to be done at galactic black hole amounts of energy sort of scale.
earth.com
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