We compute the self-force on a scalar charge at rest in the space–time of long throat. We consider arbitrary values of the mass of the scalar field and the constant of nonminimal coupling of the scalar field to the curvature of space–time. We also show the coincidence of explicit calculations of self-force in the limit of large mass of the field with known results.
Self-force on a scalar charge in radial infall from rest using the Hadamard-WKB expansion