Article
Qballs in flat potentials
Physical review D: Particles and fields 05/2009; DOI: 10.1103/PhysRevD.80.025016
Source: arXiv

Article: GaussBonnet boson stars
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ABSTRACT: We construct boson stars in (4+1)dimensional GaussBonnet gravity. We study the properties of the solutions in dependence on the coupling constants and investigate these in detail. While the "thick wall" limit is independent of the value of the GaussBonnet coupling, we find that the spiraling behaviour characteristic for boson stars in standard Einstein gravity disappears for large enough values of the GaussBonnet coupling. Our results show that in this case the scalar field can not have arbitrarily high values at the center of the boson star and that it is hence impossible to reach the "thin wall" limit. Moreover, for large enough GaussBonnet coupling we find a unique relation between the mass and the radius (qualitatively similar to those of neutron stars) which is not present in the Einstein gravity limit.Physics Letters B 08/2013; 726(4). · 6.02 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We construct electrically charged Qballs and boson stars in a model with a scalar selfinteraction potential resulting from gauge mediated supersymmetry breaking. We discuss the properties of these solutions in detail and emphasize the differences to the uncharged case. We observe that $Q$balls can only be constructed up to a maximal value of the charge of the scalar field, while for boson stars the interplay between the attractive gravitational force and the repulsive electromagnetic force determines their behaviour. We also study the motion of charged, massive test particles in the spacetime of boson stars. We find that in contrast to charged black holes the motion of charged test particles in charged boson star spacetimes is planar, but that the presence of the scalar field plays a crucial r\^ole for the qualitative features of the trajectories. Applications of this test particle motion can be made in the study of extrememass ratio inspirals (EMRIs) as well as astrophysical plasmas relevant e.g. in the formation of accretion discs and polar jets of compact objects.Physical Review D 02/2014; 89(8). · 4.86 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: A selfinteracting SU(2)doublet of complex scalar fields, minimally coupled to EinsteinGaussBonnet gravity is considered in five spacetime dimensions. The classical equations admit two families of solitons corresponding to spinning and nonspinning bosons stars. The generic solutions are constructed numerically and agree with exact results that are available in special limits of the parameters. The pattern of the boson stars is shown to be qualitatively affected by the GaussBonnet coupling constant.10/2013;
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