NASA’s IXPE May Have Proven 90-Year-Old Theory
A first of its kind measurement of a magnetar may have captured empty space behaving in a way physicists have predicted for 90 years, but never directly observed. The results published Wednesday in Nature. Fast facts Scientists using NASA’s IXPE (Imaging X-ray Polarimetry Explorer) conducted more than 140 hours of observations of the magnetar 1E […]
NASA's IXPE (Imaging X-ray Polarimetry Explorer) mission has potentially validated a 90-year-old theory regarding the behavior of empty space, as observed through a magnetar, a unique and exceptionally powerful type of neutron star. The observations, published in the journal Nature, reveal that vacuum birefringence - a prediction of quantum electrodynamics - is indeed occurring.
Magnetars, which have magnetic fields a trillion times stronger than Earth's, provide a unique laboratory for studying extreme physical conditions. The IXPE mission, in collaboration with NASA's NICER and the CSIRO's Parkes radio telescope, conducted over 140 hours of coordinated measurements of magnetar 1E 1547.0-5408. The data demonstrated that the polarization - the alignment of incoming photons - was significantly higher than anticipated, suggesting an external force at play.
Standard models of surface emission could not account for the high polarization values. This led researchers to the theory of vacuum birefringence, first proposed in 1936. The theory posits that extreme magnetic fields can alter the vacuum of space, causing it to act like a lens or prism that filters light based on its direction, thereby increasing its total polarization. The IXPE's ability to measure X-ray polarization was crucial in testing this theory.
The team's simulations support the idea that vacuum birefringence in the magnetar's environment likely accounts for the observed polarization signatures. Hoa Dinh Thi, a postdoctoral associate at Rice University and co-lead author of the study, noted that the presence of vacuum birefringence helps explain the high X-ray polarization measurements while also aligning with radio observations.
This finding marks the first direct observation of this effect, providing a rare glimpse into the fundamental physics of our universe. The results underscore the profound interdisciplinary value of astrophysics, as understanding these distant stellar phenomena can offer insights into the very fabric of reality.
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- NASA’s IXPE May Have Proven 90-Year-Old Theory science.nasa.gov
