JHEP study: black-hole gravity redshifts Josephson readings, not local rules

A theoretical study in the Journal of High Energy Physics finds that a Josephson junction held outside a black hole still obeys standard local superconducting relations, while a distant observer records redshifted voltage, frequency, current, and power. Phys.org carried an account by authors Reggie Pantig and Ali Övgün; the paper is indexed as DOI 10.1007/JHEP02(2026)006. The authors model a junction in the static exterior of a Schwarzschild black hole using gauge-invariant condensate momentum and conserved electric current. Local proper-time measurements keep the usual Josephson links between voltage and phase oscillation. Comparisons made with a distant clock multiply voltages and frequencies by the gravitational redshift factor alpha, which falls toward zero near the horizon. Critical current assigned at infinity scales with one power of alpha, while power scales with alpha squared, reflecting both slower charge transfer per distant time and redshifted energy. A vertical SQUID with junctions at slightly different potentials does not, at first order in direct-current operation, show a simple sideways shift of the entire interference pattern from gravity alone, according to the calculation. The setup is framed as a static-exterior thought experiment rather than a near-horizon hardware proposal. The central claim is that intense gravity changes how faraway instruments should report the device, not the local quantum circuit rules beside the junction.