MG11 
Talk detail
 

 Participant 

Institution

Session

Talk

Abstract

Solitonic and non-Solitonic Q-Stars

The properties of several types of Q-stars are studied: solitonic ones whose flat space limit are Q-balls, non-solitonic ones which do not have a flat space limit and a new type, Sigma stars. These are self-gravitating solutions of a non-linear Sigma model with a global U(1) symmetry. The analysis is based on calculating the mass, global U(1) charge and the binding energy (their difference) for families of solutions parameterized by the central value of the scalar field. The two most frequently used Q-star potentials are studied and although the general properties are similar in both models, there are important differences. The non-solitonic Q-stars are also analyzed with a special attention to the region of a weak scalar field where an overlap with the solitonic type is expected. Sigma stars are discussed along similar lines stressing the relation with the other two types.