No evidence for directional anisotropy in the cosmic distance duality relation is found, yielding a robust 95% upper bound of 0.025 on the dipole amplitude after accounting for survey selection effects.
Hutsem´ ekers,Evidence for very large-scale coherent orientations of quasar polarization vectors,Astronomy and Astrophysics332(1998) 410
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Directional Tests of the Cosmic Distance Duality Relation using Pantheon+ and BAO
No evidence for directional anisotropy in the cosmic distance duality relation is found, yielding a robust 95% upper bound of 0.025 on the dipole amplitude after accounting for survey selection effects.