Positive energy density in topologically charged exponential wormholes and Regge–Wheeler potential Faizuddin Ahmed, Jaydeep Goswami and Abdelmalek Bouzenada Eur. Phys. J. C, 85 1 (2025) 110 Published online: 30 January 2025 DOI: 10.1140/epjc/s10052-025-13819-5