Quantum-inspired wormholes from string T-duality

The intrinsic non-perturbative features of string-theoretic corrections, particularly those arising from T-duality, have been shown to naturally introduce an effective ultraviolet (UV) cutoff into the gravitational framework. This cutoff, often referred to as the zero-point length in the context of path integral duality, acts as a fundamental minimal length scale that regulates short-distance divergences. Using the established correspondence between T-duality and path integral duality, it has been shown that the static Newtonian potential becomes regularized at small distances. Building upon this regular behavior, we proceed to construct self-consistent, spherically symmetric, and electrically neutral wormhole solutions, which remain free of curvature singularities and embodies the effects of this duality-induced UV completion. We explore wormhole configurations with the aim of minimizing violations of the null energy condition (NEC). In fact, solutions with a constant redshift function or specific shape functions generally exhibit NEC violations throughout the entire spacetime. To address this, we explore two distinct thin shell constructions: (i) wormholes formed by matching an interior wormhole geometry to an exterior Schwarzschild vacuum spacetime, thereby confining exotic matter to a localized region; and (ii) standard thin-shell wormholes generated by gluing two identical black hole spacetimes across a timelike hypersurface situated outside their event horizons. In both cases, the NEC violations are minimised and restricted to a finite region, improving the physical plausibility and traversability of the resulting configurations.