l-Boson Stars

BARRANCO, JUAN; DIEZ-TEJEDOR, ALBERTO; SARBACH, OLIVIER; BERNAL, ARGELIA; MEGEVAND, MIGUEL; ALCUBIERRE, MIGUEL; DEGOLLADO, JUAN CARLOS; NÚÑEZ, DARÍO

Valencia

Congreso; 22nd International Conference on General Relativity and Gravitation; 2019

We present new, fully nonlinear numerical solutions to the static, spherically symmetric Einstein-Klein-Gordon system for a collection of an arbitrary odd number N of complex scalar fields withan internal U(N) symmetry and no self-interactions. These solutions, which we dub l-boson stars,are parametrized by an angular momentum number l=(N-1)/2, an excitation number n, and acontinuous parameter representing the amplitude of the fields. They are regular at every pointand possess a finite total mass. We also present results of numerical simulations of perturbed l-boson stars, for different values of l, in order to study their stability. We show that for unstableconfigurations there are three possible final states: collapse to a black hole, migration to thestable branch, and explosion to infinity.