Plate Nº 26 · recorded October 10, 2026
Space & AstronomyReported finding
Magnetar May Yield First Evidence of 90-Year-Old Quantum Prediction
Observations of magnetar 1E 1547.0-5408 suggest that supposedly empty space alters polarized light, hinting at the first evidence of a 1930s Heisenberg prediction.
By Elena Vasquez3 min read550 words
In brief
- Nature published the study on August 26, 2026 (volume 656, issue 8128, page 590); DOI: 10.1038/s41586-026-10859-z.
- Detecting vacuum birefringence requires magnetic fields over 100 million times stronger than any produced on Earth, according to co-author Marcus Lower.
- The team observed magnetar 1E 1547.0-5408 using CSIRO's Murriyang (Parkes) radio telescope, NASA's IXPE, and the NICER X-ray telescope on the ISS.
- Lead author Rachael E. Stewart is a graduate student in physics at George Washington University.
- Werner Heisenberg predicted vacuum birefringence in the 1930s, nearly 90 years before these observations.
A study published on August 26, 2026 in Nature reports that observations of an extraordinarily magnetic collapsed star show signs of "vacuum birefringence," an effect Werner Heisenberg first predicted in the 1930s. If confirmed, it would mark the first direct evidence that supposedly empty space can bend light.
The team, led by Rachael E. Stewart, a graduate student in physics at George Washington University, targeted a magnetar called 1E 1547.0-5408, a rare type of neutron star whose magnetic field ranks among the strongest known. Co-author Dr. Marcus Lower, an Australian Research Council DECRA Fellow at Swinburne University of Technology, explained why such a star matters.
"Detecting vacuum birefringence requires a magnetic field that is over 100 million times stronger than any we've ever made on Earth," Lower said. "Thankfully, nature has provided us with magnetars, which are the perfect cosmic laboratories to go looking for this effect."
What is vacuum birefringence?
In ordinary crystals such as calcite, a single beam of light can split into two. The trick relies on polarization, the direction in which each light wave oscillates.
Heisenberg argued that even a perfect vacuum is not truly empty. Quantum theory allows fleeting "virtual particles" to pop in and out of existence. In an intense magnetic field, those virtual particles should align with the field lines. Light crossing the field should then shift its polarization, just as it does in a crystal.
The predicted effect carries the name "vacuum birefringence," often abbreviated VB. Despite 90 years of theory and decades of accelerator experiments, no one has conclusively observed it.
What did the telescopes see?
The researchers pointed three instruments at 1E1547. Lower led the radio observations using CSIRO's Murriyang radio telescope, also known as Parkes, in Australia. They processed the data on Swinburne University's Ngarrgu Tindebeek supercomputer.
They combined those radio results with X-ray measurements from NASA's Imaging X-ray Polarimetry Explorer (IXPE) and from NICER, an X-ray telescope aboard the International Space Station. As the magnetar spun, the team tracked how polarization rotated through each rotation cycle.
Both the radio and X-ray signals carried unusually high polarization. In X-rays, polarization approached 100% in certain energy bands. The polarization direction of the X-rays stayed locked onto the magnetar's magnetic field, just as vacuum birefringence predicts.
Why is this magnetar special?
The geometry of 1E1547 works in the researchers' favor. The star's magnetic axis and rotation axis sit nearly parallel. Earth views the object almost straight down its rotational pole.
That vantage point cleanly separates polarization changes from geometric effects, sharpening any birefringence signal. Stewart and her colleagues caution that other astrophysical processes could in principle mimic the pattern. Confirmation will take more data and more detailed computer simulations.
What's next?
The team plans further multi-wavelength observations of 1E1547 and other magnetars, alongside tighter simulations of light propagation in extreme magnetic fields. Lower captured the stakes this way:
"With these future data on hand and our updated simulations, we may finally be able to complete the quest started by Heisenberg nearly 90 years ago."
If the result holds up, physicists would gain a long-sought tool for testing quantum field theory under magnetic conditions a hundred million times stronger than any laboratory can produce.
via universetoday.com (Original)
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