Scientists may have finally caught “empty” space changing light
Scientists have found potential evidence of vacuum birefringence, a quantum effect where empty space alters light, by observing a magnetar. This phenomenon, predicted by Werner Heisenberg, occurs when strong magnetic fields cause virtual particles to influence light travel.
Why it matters
This discovery provides a rare opportunity to test quantum physics under extreme conditions that are impossible to replicate in Earth-based laboratories.
Nearly 90 years ago, Werner Heisenberg predicted a strange quantum effect known as vacuum birefringence, in which seemingly empty space can change the way light behaves. According to the idea, even a perfect vacuum is not truly empty. Instead, it should contain "virtual particles" that briefly appear and disappear.
Despite major advances in nuclear physics since the 1930s and decades of work with particle accelerators, scientists have not been able to conclusively confirm the effect. Now, observations of one of the most extreme objects in the Universe may provide the evidence researchers have been seeking.
A team of scientists studied a magnetar, a rare kind of neutron star with some of the strongest magnetic fields known in the Universe. Their results may represent the first evidence of vacuum birefringence and could open new ways to investigate quantum physics under conditions that cannot be reproduced on Earth.
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