Solitonic Boson Stars: Numerical solutions beyond the thin-wall approximation (2203.08203v2)

Abstract: In this paper we present several set of solutions of static and spherically symmetric solitonic boson stars. Each set is characterized by the value of {\sigma} that defines the solitonic potential in the complex scalar field theory. The main features peculiar to this potential occur for small values of {\sigma}, but for which the equations become so stiff as to pose numerical challenges. Without making approximations we build the sets for decreasing {\sigma} values and show how they change their behavior in the parameter space, giving special attention to the region where thin-wall configurations dwell. The validity of the thin-wall approximation is explored as well as the possibility of the solution sets being discontinuous. We investigate five different possible definitions of a radius for boson stars and employ them to calculate the compactness of each solution in order to assess how different the outcomes might be.