Evidence for Cosmic Harmonic Periodicity in Galaxy.

We present Bayesian evidence for harmonic periodicities in the cosmic evolution of galax- ies. Analyzing 59,569 galaxies from 7 independent JWST elds and 1,734 galaxies from SDSS/eROSITA, we detect a fundamental frequency ω0 = 0.191 ± 0.012 in SDSS with decisive evidence (log BF = 107.1). In JWST data, we identify multiple harmonics follow- ing ωn = n × 0.191 for n = 2, 3, 4, 6, with ω = 0.764 appearing consistently across elds (log BF > 800). The total Bayesian evidence (log BFtotal > 2500) strongly supports the exis- tence of cosmic periodicities that evolve signicantly with redshift (σω = 0.1463), suggesting physics beyond standard ΛCDM evolution.