A Falsifiable Upper-Bound Framework for a Hypothetical Holographic Entropy–Gravity Coupling in Superconducting YBCO

We present an open-source computational framework exploring whether entropy gradients induced in a YBCO superconductor by combined cryogenic, magnetic, femtosecond-laser, acoustic, and rotational stimuli could couple to a holographic gravitational screen, following speculative extensions of the Ryu–Takayanagi entanglement-entropy proposal and Verlinde's entropic-gravity conjecture, informed by the strong-coupling regime discussed in Bianconi (Phys. Rev. D 111, 066001, 2025). The final step — coupling a BCS entropy gradient to a holographic screen — is not derived from any established theory: it is carried by a single free parameter, alpha_coupling, treated explicitly rather than hidden inside a fitted constant. Under the optimistic, unconstrained choice alpha_coupling = 1, the framework returns δg/g ≈ 1.6×10⁻⁴, within reach of the ARCHIMEDES precision-gravimetry experiment. This is reported as an upper bound and experimental target, not a prediction. Full simulator source code (Python, 6/6 validation tests) is included alongside the note.