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Retraction reveals false confirmation of birefringence prediction in a population-scale analysis, indicating a kinematic artifact.
RETRACTION (2026-06-06). The central claim of this paper - a 4.4 sigma population-scale confirmation of prediction CCXLV-FP1 (throat-threaded magnetic birefringence) - is RETRACTED. The reported partial correlation rho(Delta, chi_p*M^2 | chi_eff)=+0.346 is a KINEMATIC ARTIFACT. The test regressed a remnant-spin residual on chi_p*M^2 using the LVK 'final_spin', which is a numerical-relativity fitting-formula output (a deterministic function of the inferred inspiral component spins); the CCLVI baseline removed only the mass-ratio dependence, so the residual is pure inspiral-spin information and any spin-derived regressor correlates tautologically. Under a spin-aware baseline the significance collapses from 6.84 sigma to 0.00 sigma (audit 2026-06-02, N=189). 'final_spin' has no independent birefringence sensitivity and cannot test a spin-sourced prediction at any sample size. PREDICTION STATUS: CCXLV-FP1 is reclassified UNTESTED (not falsified); the only valid test uses an independent ringdown-QNM remnant spin (dchi = chi_rd - chi_NRfit) regressed on chi_p*M^2 - on the N=5 events with published independent ringdown spins the result is consistent with zero (weak bound, no detection; the one non-zero point, GW190521, is precession-confounded). This record is retained for provenance; the confirmation claim should not be cited. NOTE: this record was published in error by an automated batch on 2026-06-06, after the 2026-06-02 withdrawal. Bharathi Dasan Jagadeesan, M.D., University of Minnesota CMRR. ORCID 0000-0002-1143-941X. CC-BY-4.0.
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Bharathi Jagadeesan (2026) studied this question.
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