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Lurking behind Einstein’s theory of gravity and our modern understanding of particle physics is the deceptively simple idea of symmetry. But physicists are beginning to question whether focusing on symmetry is still as productive as it once was.
Opinions differ about what recent measurements of a sound-trapping fluid reveal about light-trapping black holes.
The same codes needed to thwart errors in quantum computers may also give the fabric of space-time its intrinsic robustness.
A controversial new paper argues that universes with dark energy profiles like ours do not exist in the “landscape” of universes allowed by string theory.
Gravitational waves have opened up new ways to test the properties of black holes — and Einstein’s theory of gravity along with them.