Particle-like solutions in the generalized SU(2) Proca theory

The generalized SU(2) Proca theory is a vector-tensor modified gravity theory where the action is invariant under both diffeomorphisms and global internal transformations of the SU(2) group. This work constitutes the first approach to investigate the physical properties of the theory at astrophysical scales. We have found solutions that naturally generalize the particle-like solutions of the Einstein-Yang-Mills equations, also known as gauge boson stars. Under the requirement that the solutions must be static, asymptotically flat, and globally regular, the t'Hooft-Polyakov magnetic monopole configuration for the vector field rises as one viable possibility. The solutions have been obtained analytically through asymptotic expansions and numerically by solving the boundary value problem. We have found new features in the solutions such as regions with negative effective energy density and imaginary effective charge. We have also obtained a new kind of globally charged solutions for some region in the parameter space of the theory. Furthermore, we have constructed equilibrium sequences and found turning points in some cases. These results hint towards the existence of stable solutions which are absent in the Einstein-Yang-Mills case.

Automated summary

The generalized SU(2) Proca theory is investigated for its physical properties at astrophysical scales, revealing particle-like solutions known as gauge boson stars. The t'Hooft-Polyakov magnetic monopole configuration emerges as a viable possibility for the static, asymptotically flat, and globally regular solutions. Analytical and numerical methods are used to obtain these solutions, finding new features such as negative effective energy density and imaginary effective charge regions. Additionally, equilibrium sequences and turning points indicate the existence of stable solutions absent in the Einstein-Yang-Mills case.