{"id":1114,"date":"2026-08-08T18:20:00","date_gmt":"2026-08-08T09:20:00","guid":{"rendered":"https:\/\/onepress.co.kr\/?post_type=briefing&#038;p=1114"},"modified":"2026-08-08T18:24:31","modified_gmt":"2026-08-08T09:24:31","slug":"2026-08-08-magnetar-vacuum-birefringence-en","status":"publish","type":"briefing","link":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-08-08-magnetar-vacuum-birefringence-en\/","title":{"rendered":"Empty space may filter light like a prism, confirming a 90-year idea"},"content":{"rendered":"<p><strong>2026-08-08 18:25 KST<\/strong><\/p>\n<p>Empty space around an ultra-magnetic star appears to filter light like a prism. The signal may be the first direct detection of vacuum birefringence, predicted in 1936.<\/p>\n<p>It is the strongest evidence yet, not a final confirmation. The team says more observations of this and other magnetars are required.<\/p>\n<h2>How can empty space act like a prism?<\/h2>\n<p>Quantum electrodynamics predicts that an extreme magnetic field changes how light travels through a vacuum, depending on its orientation.<\/p>\n<h2>What was measured?<\/h2>\n<p>NASA IXPE watched magnetar 1E 1547-5408 for over 140 hours. Its X-ray polarization was nearly three times higher than in similar sources and changed smoothly during each 2.1-second rotation.<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/onepress.co.kr\/wp-content\/uploads\/2026\/08\/magnetar-vacuum-birefringence-en.jpg\" alt=\"Illustration of X-ray polarization changing around a strongly magnetized neutron star\" loading=\"lazy\" \/><figcaption class=\"op-briefing-image-caption\">ONEPRESS generated explanation of vacuum birefringence, not an observation image.<\/figcaption><\/figure>\n<h2>Could something else explain it?<\/h2>\n<p>Standard surface-emission models could not produce the large alignment. Simulations constrained by radio data reproduced it only when vacuum birefringence was included.<\/p>\n<h2>Why is the wording cautious?<\/h2>\n<p>The measurement and model agree strongly, but space is not a controlled laboratory. Repeated signals from more IXPE observations are still needed.<\/p>\n<h2>Official primary sources<\/h2>\n<p><a href=\"https:\/\/science.nasa.gov\/missions\/ixpe\/nasas-ixpe-may-have-proven-90-year-old-theory\/\" target=\"_blank\" rel=\"noopener noreferrer\">Primary source: NASA IXPE official science release<\/a><\/p>\n<p><a href=\"https:\/\/www.nature.com\/articles\/s41586-026-10859-z\" target=\"_blank\" rel=\"noopener noreferrer\">Primary source: Nature original research article<\/a><\/p>\n<p><a href=\"https:\/\/news.rice.edu\/news\/2026\/ixpe-observations-offer-strongest-evidence-yet-vacuum-birefringence\" target=\"_blank\" rel=\"noopener noreferrer\">Primary source: Rice University research release<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A magnetar produced the strongest signal yet of vacuum birefringence. It may be the first direct detection, but more observations are needed.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-1114","briefing","type-briefing","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing\/1114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing"}],"about":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/types\/briefing"}],"wp:attachment":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/media?parent=1114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}