Speaker
Description
Recently, a new class of fully nonlinear numerical solutions to the static, spherically symmetric Einstein-Klein-Gordon system for a collection of an arbitrary odd number of complex scalar fields with an internal U(N) symmetry was found. These solutions are parametrized by an angular momentum number l, an excitation number n, and a continuous parameter representing the amplitude of the fields. They are regular at every point, possess a finite total mass, and they generalize the standard spherically symmetric boson stars to arbitrary values of l. In this talk, we discuss the main properties of these l-boson stars, including their stability with respect to small perturbations, their compactness, the large l limit, their pressure anisotropy and some preliminary results regarding their interpretation as a solution of the semi-classical Einstein-Klein-Gordon equations.
