Phase diagrams of charged compact boson stars

Kumar, Sanjeev  (Aff1, 0000 0001 2109 4999, grid.8195.5, Department of Physics and Astrophysics, University of Delhi, 110007, New Delhi, India) (Aff2, 0000 0004 1790 2262, grid.411524.7, Department of Physics, Pt. NRS Government College, M.D. University, 124001, Rohtak, India) ; Kulshreshtha, Usha (Aff3, 0000 0001 2109 4999, grid.8195.5, Department of Physics, Kirori Mal College, University of Delhi, 110007, New Delhi, India) (Aff4, 0000 0001 1009 3608, grid.5560.6, Institut für Physik, Universität Oldenburg, Postfach 2503, 26111, Oldenburg, Germany) ; Kulshreshtha, Daya Shankar (Aff1, 0000 0001 2109 4999, grid.8195.5, Department of Physics and Astrophysics, University of Delhi, 110007, New Delhi, India) (Aff4, 0000 0001 1009 3608, grid.5560.6, Institut für Physik, Universität Oldenburg, Postfach 2503, 26111, Oldenburg, Germany) ; Kunz, Jutta (Aff4, 0000 0001 1009 3608, grid.5560.6, Institut für Physik, Universität Oldenburg, Postfach 2503, 26111, Oldenburg, Germany)

12 June 2019

Abstract: Compact boson stars, whose scalar field vanishes identically in the exterior region, arise in a theory involving a massless complex scalar field with a conical potential, when coupled to gravity. Their charged compact generalizations, obtained in the presence of a U(1) gauge field, exhibit further interesting features. On the one hand, charged compact boson shells can arise, whose scalar field vanishes also in the central region, while on the other hand, the domain of existence of charged compact boson stars exhibits bifurcation points. First 2D phase diagrams have been studied before. Here we extend these earlier studies to a larger range of the variables and study additional phase diagrams. We then extend these studies to obtain 3D phase diagrams and present these with a detailed discussion of their various regions with respect to the bifurcation points and argue, that there is an infinite series of such bifurcation points. Thus the theory is seen to contain rich physics in a particular domain of the phase diagrams. We also discuss the dependence of the fields on the dimensionless radial coordinate for some representative points of the phase trajectories in the phase diagrams of the theory.


Published in: EPJC 79 (2019) 496 DOI: 10.1140/epjc/s10052-019-7006-y
License: CC-BY-3.0



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