Two separate laboratory breakthroughs — one using a metamaterial time mirror for electromagnetic waves, the other a quantum 'rewind' protocol for single particles — have demonst...
A new preprint argues that a re-interpretation of Landauer conductance and a locally defined density of states resolve the quantum measurement problem and enable time travel via...
Physicists have long studied whether the past or future can be reached. This article reviews what general relativity and quantum theory actually allow, what experiments are test...
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