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Vacuum birefringence and the polarized X-ray emission from a radio magnetar
Abstract Magnetars are isolated neutron stars with exceptionally strong surface fields exceeding 1014 G (ref. 1). Their bright X-ray emission probes physical regimes in which quantum electrodynamics (QED) influences radiation propagation2,3,4. Strong magnetic fields induce polarization-dependent refractive indices in the vacuum5,6; such vacuum birefringence remains a long-standing but unconfirmed prediction of QED.
Pulsed and Polarized X‐Ray Emission From Neutron Star Surfaces
Conflicts of Interest The authors declare no conflicts of interest. References , , , , , and . 2010. “A Unified Timing and Spectral Model for the Anomalous X-ray Pulsars XTE J1810-197 and CXOU J164710.2-455216.” Astrophysical Journal 722: 788–802. , , and . 2021. “Polarized Radiation Transfer in Neutron Star Surface Layers.” Monthly Notices of the Royal Astronomical Society 500: 5369–5392. , and . 2007.
Rapid spin changes around a magnetar fast radio burst - Nature
Abstract Magnetars are neutron stars with extremely high magnetic fields (≳1014 gauss) that exhibit various X-ray phenomena such as sporadic subsecond bursts, long-term persistent flux enhancements and variable rotation-period derivative1,2. In 2020, a fast radio burst (FRB), akin to cosmological millisecond-duration radio bursts, was detected from the Galactic magnetar SGR 1935+2154 (refs. 3,4,5), confirming the long-suspected association between some FRBs and magnetars.
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