UFFT-SFT MHz-Band Gravitational-Wave Signatures

This document outlines a novel theoretical and experimental approach to detecting gravitational-wave signatures in the MHz frequency band (10–200 MHz), a largely unexplored regime in gravitational-wave astronomy. Motivated by Unified Field Theory/String Field Theory (UFFT/SFT), the paper defines six signature families: (1) broadband blue rise with turnover, (2) narrow or moderately broad resonances (dark-phonons), (3) spectral combs, (4) intermittent avalanche (“crackling”) statistics, (5) circular-polarization asymmetries, and (6) weak dispersive effects. Each signature is mathematically parameterized, with interpretations linked to substrate–metric interactions, potentially arising from exotic microphysical processes. The paper introduces four diagnostic methods to isolate substrate effects, including metric/refractive co-variance, nonlinear arm-length scaling, thermal set-point imprint, and orientation response tests. A detailed parameter grid and analysis workflow are provided to facilitate experimental implementation using dual, co-located interferometers. This work offers a falsifiable framework for probing high-frequency gravitational waves and exotic physics, with applications to next-generation interferometric experiments.