A conference review of IXPE's first three years concludes that X-ray polarimetry is a promising new diagnostic for fundamental physics, with the most promising target being axion-like particle induced polarization in galaxy clusters.
Constraints on Lorentz Invariance Violation using INTEGRAL/IBIS observations of GRB041219A
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abstract
One of the experimental tests of Lorentz invariance violation is to measure the helicity dependence of the propagation velocity of photons originating in distant cosmological obejcts. Using a recent determination of the distance of the Gamma-Ray Burst GRB 041219A, for which a high degree of polarization is observed in the prompt emission, we are able to improve by 4 orders of magnitude the existing constraint on Lorentz invariance violation, arising from the phenomenon of vacuum birefringence.
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Astronomical X-ray Polarimetry as a diagnostic for questions of fundamental Physics. What we learned from the Imaging X-Ray Polarimetry Explorer (IXPE)
A conference review of IXPE's first three years concludes that X-ray polarimetry is a promising new diagnostic for fundamental physics, with the most promising target being axion-like particle induced polarization in galaxy clusters.