Testable Predictions of Bounce-Linked Multiverses: GW and CMB Signatures from BBR

Multiverse theories (Eternal Inflation, String Landscape) are notoriously difficult to test due to isolation of bubble universes and infinite volume. Bergmann Bounce Relativity (BBR) and the Bergmann Multi-Cycle (BMC) connect bubbles via stochastic mini-bounce overlaps, enabling information exchange and producing observable signatures. This paper derives quantitative predictions for gravitational wave (GW) backgrounds from bounce overlaps (h_c ≈ 10^{-16} at f ≈ 10^{-16} Hz) and CMB anomalies (cold spots, rings, power spectrum deviations at low ℓ) from stabilized bubble collisions. Stability analyses show bounces dampen instabilities, allowing detectable signals in LISA, Euclid, CMB-S4, and SKA. BBR/BMC transform multiverses from untestable speculation into a falsifiable framework, unifying quantum gravity, inflation, and cosmology.