A formal experimental pre-registration establishing a permanent public timestamp that the theoretical prediction stated below was made before any experimental data was collected. Entropic Field Theory (EFT) predicts a non-monotonic gravitational anomaly in a BCS-type superconductor cooling through its critical temperature. The effective gravitational coupling Gₑff (T) /G = √ (Varₙormal (Tc) / VarBCS (T) ) follows a non-monotonic curve with a parameter-free sign change at 0. 88 Tc. For a 110g BSCCO-2223 sample at 77K, the predicted apparent weight anomaly is +10. 8g (≈10%). The prediction carries zero free parameters. The dip-then-rise signature with sign change at exactly 0. 88 Tc is the decisive observable. Effect is absent in the normal state (T > Tc) and in non-superconducting controls. Sample: Bismuth strontium calcium copper oxide Bi-2223, bulk disc 80mm diameter, >85% relative density, >90% phase purity, measured at 77K (liquid nitrogen). Two units for independent replication. EFT standalone publication: DOI 10. 5281/zenodo. 18963986 Companion paper EQ (vT): DOI 10. 5281/zenodo. 18917317 Full experimental methodology will be disclosed upon publication of results.
Michael Adis (Wed,) studied this question.