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.
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Hemispherical analysis of Pantheon+ supernovae detects residual dipolar anisotropy in q0 (Δq0=0.112, S/N=2.155) even in the z_HD frame, reduced when using an SNe-inferred dipole, indicating possible unmodeled bulk flows.
citing papers explorer
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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.
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Comparing Hemispheres: Anisotropy in the deceleration parameter $q_0$
Hemispherical analysis of Pantheon+ supernovae detects residual dipolar anisotropy in q0 (Δq0=0.112, S/N=2.155) even in the z_HD frame, reduced when using an SNe-inferred dipole, indicating possible unmodeled bulk flows.