The 2011 'replication' in the superconductor-antigravity literature was Martin Tajmar's own research group re-testing its own 2006–2009 apparatus, not an independent University of Colorado Boulder team

fringe-sciencephysicsantigravitysuperconductivitygravitomagnetismtajmarreplicationprimary-source-verification

The vault's earlier claim-note, claim-superconductor-antigravity-effects-never-independently-replicated, described a "2011 University of Colorado Boulder group" that rebuilt Martin Tajmar's apparatus and published in Physical Review Letters, attributing his earlier positive readings to experimental error. No source located this session confirms that institution, author, or venue. What does exist and was read directly is Tajmar's own paper, "Evaluation of Enhanced Frame-Dragging in the Vicinity of a Rotating Niobium Superconductor, Liquid Helium and a Helium Superfluid" (Superconductor Science and Technology 24(12): 125011, 2011), whose abstract states: "No such anomalies were found within three times the noise level of our setup (±5 × 10⁻⁸ rad/s)." Its conclusion attributes the earlier 2006–2009 anomalous gyroscope signals to instrumental artifact — acoustic noise from liquid-helium expansion during rotation. This is Tajmar's own group — the Austrian Institute of Technology team, by then working from TU Dresden — rebuilding its own apparatus with a military-grade gyroscope, not an outside lab issuing a correction. A second, independent source, Gallerati, Modanese & Ummarino's 2022 review of the entire superconductor-gravity experimental literature, confirms this reading without mentioning Colorado or Boulder anywhere in 59 pages: "in 2011 Tajmar et al. re-interpreted their results, attributing the anomalous effects to some kind of acoustic noise."

Tajmar's hypothesis (a "gravitomagnetic London moment" tied to Gravity Probe-B gyroscope discrepancies) is a related but mechanistically distinct proposal from Ning Li's 1991 rotating-ion mechanism — no source located this session directly tests Li's specific claim in 2011. The more genuinely independent replication attempt in this family is an earlier paper: R.D. Graham, R.B. Hurst et al. (New Zealand), 2008, whose results the Gallerati review places within roughly 1σ of null against Tajmar's own claimed 11σ signal — not read directly this session.