Local Strong-Field Properties of Anisotropic Traversable Wormholes in dRGT- f ( R , T ) Massive Gravity

We investigate local strong-field properties of anisotropic traversable wormholes in dRGT-f(R, T) massive gravity. We identify the physically admissible anisotropic branch and show that the isotropic branch fails the Morris–Thorne traversability conditions. Since the resulting geometry is generally non-asymptotically flat, we focus on local near-throat observables. Using the proper radial formulation, we demonstrate that the throat provides a local photon-trapping surface and analyze the corresponding throat-controlled optical scale. This scale is found to be more sensitive to the massive-gravity parameter γ than to the effective cosmological parameter Λ. We further derive the scalar perturbation potential and formulate the associated WKB and grey-body factor frameworks for localized wave dynamics. Numerical quasinormal frequencies and grey-body spectra are not evaluated here and are left for future investigation.