Einstein-Rosen bridges may connect mirror versions of time

New research reinterprets the Einstein-Rosen bridge as a connection between two directions of time rather than a spatial shortcut. The study suggests this view could resolve the black hole information paradox and point to a universe that existed before the Big Bang. It was published in the journal Classical and Quantum Gravity.

Physicists Enrique Gaztanaga, K Sravan Kumar and João Marto argue that the 1935 Einstein-Rosen bridge was never meant to describe a traversable wormhole. Instead, they say it represents a mathematical link between two symmetrical copies of spacetime, each with an opposite arrow of time. This interpretation arises from applying modern quantum ideas to the original equations that connect gravity and quantum fields.

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An international team of physicists has found that quantum collapse models, potentially linked to gravity, introduce a minuscule uncertainty in time itself. This sets a fundamental limit on clock precision, though far below current detection levels. The research, published in Physical Review Research, explores ties between quantum mechanics and gravity.

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Physicists at MIT have developed a theoretical technique inspired by the film Interstellar to send messages backwards in time using quantum entanglement. The approach mimics closed time-like curves and surprisingly improves communication through noisy channels. While actual time travel remains impossible, the idea could enhance conventional systems.

Astronomers have uncovered evidence that a black hole and neutron star merged while following an unusual oval-shaped orbit, challenging expectations of circular paths in such events. The discovery comes from a reanalysis of gravitational wave data from the event known as GW200105. This finding suggests the system formed in a dynamic stellar environment.

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Physicists have published research proposing that a single clock could tick both faster and slower at the same time due to quantum effects. The work combines relativity and quantum mechanics in a novel way. Researchers say advances in atomic clock technology may soon allow the idea to be tested in the lab.

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