Relativistic Quantum Effects on Scalar Bosons in Morris–Thorne-Type Wormhole Space-Time with a Cosmic String

In this study, the relativistic quantum motion of spin-0 scalar bosons within the framework of Morris–Thorne-type wormhole space-time accompanied by a cosmic string is studied. We tackle the problem by solving the relativistic Klein–Gordon equation using the confluent Heun equation. We determine the ground state energy level, denoted as \(E_{1,m}\), as well as the corresponding wave function, denoted as \(\psi _{1,m}\). Interestingly, the investigation reveals that both the cosmic string parameter and the wormhole throat radius have an impact on the relativistic eigenvalue solution, thereby modifying the energy spectrum. Furthermore, the presence of the quantum flux field induces a shift in the energy levels, leading to the gravitational analogue of the Aharonov–Bohm effect.