White Holes as Viscoelastic Elastic Rebound and Stress Relaxation Dynamics

Abstract In classical General Relativity, white holes are treated as time-reversed counterparts to black holes, presenting severe thermodynamic paradoxes, violations of the second law, and instabilities because they require fine-tuned initial conditions without a physical generation mechanism. Within the Dynamic Substrate Theory (DST), where the physical vacuum is modeled as a memory-endowed Maxwell-Oldroyd-B viscoelastic fluid, space-time manifolds are governed by continuous medium mechanics. In this work, we demonstrate that white holes emerge naturally not as unphysical time-reversals, but as an elastic rebound and forward-in-time stress relaxation phase of the substrate. When extreme gravitational compression stores elastic strain energy up to the structural yield limit, the relaxation time (\lambda_1) triggers a rapid mechanical unloading phase, converting stored historical tension into outward-directed kinetic expansion and mass-energy ejection. Keywords: White Holes, Viscoelastic Rebound, Stress Relaxation, Maxwell-Oldroyd-B Vacuum, Emergent Astrophysics, Substrate Dynamics.