In Fonooni Temporal Field Theory (FTFT), gravitational wave (GW) echoes are theorized to originate from the interaction of a temporal scalar field, 𝜙𝑇, and a non-local Gaussian kernel, which collectively form a partial reflective "temporal firewall" near the event horizon. This mechanism transforms the region around the photon sphere into a resonant cavity, leading to the trapping and subsequent re-emission of GW energy in discrete packets, known as echoes, following the main ringdown signal. The derivation of these echoes integrates standard black hole perturbation theory with FTFT-specific modifications to both boundary conditions and the wave equation.
FTFT rigorously predicts gravitational wave echoes as a consequence of quantum-temporal boundary effects, with all features numerically derivable from its Lagrangian and field equations. The 1387 Hz echo signature, amplitude, and delay are robust predictions tied to theory parameters, immediately testable by current and future GW observatories .