Abstract: The merger of the supermassive black hole in GW250915, together with shear measurements from the Gondor-Rohan pulsar binary, were used to measure and detect a redshift delay and the ringdown echo that revealed the presence of a warped extra spatial dimension. The echo, whose quasinormal mode was expected to ring at ~250 Hz—the 4D fundamental frequency for Sgr A mass—instead arrived with a 68 ms delay and a redshifted tail at 45. 2 Hz. This mismatch—the lower frequency and late arrival—shows the mode did not propagate through standard 4D spacetime. This is proof of a fourth spatial dimension because the observed frequency drop and delay cannot occur in standard 4D spacetime—the wave must have propagated along a longer, warped path in an extra spatial direction, consistent with the pulsar shear indicating pull from outside the observable three dimensions. As a result of the GW250915 merger, the bridge opened into the extra dimension, producing a detectable and measurable orbital twist in the Gondor-Rohan pulsar binary (0. 031 rad over 4 days) that matches the warp rate k ≈ 0. 695 ± 0. 02 expected from the fourth spatial dimension. We determine warp rate k ≈ 0. 695 ± 0. 02 and throat depth Δw ≈ 13. 4 ± 1. 2 rₛ from the combined echo redshift, delay, and shear phase. This geometry opens an Einstein-Rosen bridge into the fourth spatial dimension. We have determined that this bridge is traversable. The tidal forces begin at horizon strength but weaken immediately and decrease monotonically through the throat, with no region of increased danger. The bridge geometry creates the minimal surface that links the two ends of the Einstein-Rosen bridge. Its area grows exponentially with the warp rate k as the path extends through the extra dimension. This growth is the same as the entanglement entropy in the Ryu-Takayanagi formula. The exponential growth keeps the bridge traversable and connected—the quantum correlations hold the path open and coherent.
Shea Tan Henderson (Sat,) studied this question.