Has vacuum birefringence been seen at long last?
Polarized X-rays from magnetar could be first direct observation of quantum effect The post Has vacuum birefringence been seen at long last? appeared first on Physics World .
Astronomers have reportedly observed the long-sought phenomenon of vacuum birefringence for the first time, according to a US-led international team. This prediction from quantum electrodynamics could serve as a natural laboratory for studying extreme-field phenomena in the quantum vacuum. However, another group led by Italian researchers remains skeptical and suggests alternative explanations.
Birefringence is the phenomenon where a medium's refractive index varies depending on the polarization of the radiation passing through it. The researchers detected this effect in the X-rays emitted by a neutron star that is both a magnetar and a pulsar, with extremely powerful magnetic fields. This observation, if confirmed, could provide insights into other extreme-field phenomena in the quantum vacuum.
While the US-led team asserts that their findings support vacuum birefringence driven by the magnetar's strong magnetic field, another Italian-led group questions the interpretation. They argue that the X-ray and radio emissions could be compatible without requiring vacuum birefringence. The debate continues as researchers investigate further to uncover more evidence.
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