Non-exotic Morris–Thorne wormhole with Karmarkar condition and cosmological constant

In this work, we investigate a traversable wormhole in general relativity (GR) with a cosmological constant ([Formula: see text]). As a shape function plays a crucial role in the construction of wormhole solutions, we apply the Karmarkar condition to find the wormhole shape function (WSF). The derived WSF creates wormhole geometry that connects two asymptotically flat surfaces in spacetime and meets all the required criteria. We use various graphs to analyze the energy conditions (ECs) and the anisotropic parameter ([Formula: see text]). Furthermore, we employ the causality and Herrera cracking methods to determine the wormhole’s stability and conclude that all essential criteria are met. Hence, GR provides a stable, traversable wormhole solution that can be sustained in the presence of non-exotic matter by introducing a cosmological constant.