Non-Emissive White Holes as Outward Spacetime Curvature Bulges

Black holes are traditionally understood as regions of spacetime exhibiting extreme inward curvature,resulting in horizons from which no information can escape. White holes, commonly interpreted as timereversed black holes, are generally dismissed as unphysical due to instability, continuous emission, andlack of observational evidence. This paper proposes an alternative conceptual framework: a non-emissive, mass-independent outward curvature of spacetime, referred to here as a spacetime bulge. Unlike classical white holes, thisstructure does not emit radiation, does not require exotic matter, and may contain no matter at all. Despiteits outward curvature, such a geometry may produce gravitational lensing, time dilation, and trajectorydeflection effects observationally similar to black holes, potentially leading to misclassification. The model is developed conceptually within the framework of General Relativity, focusing on phenomenology and observational consequences rather than explicit metric solutions.