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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spontaneous scalarization of boson stars

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Brihaye, Yves [1] ; Hartmann, Betti [2]
Total Authors: 2
[1] Univ Mons Hainaut, Phys Math, Pl Parc 1, B-7000 Mons - Belgium
[2] Univ Sao Paulo, IFSC, CP 369, Ave Trabalhador Sao Carlense 400, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of High Energy Physics; n. 9 SEP 6 2019.
Web of Science Citations: 0

We study the spontaneous scalarization of spherically symmetric, asymptoically flat boson stars in the (alpha R + gamma G)phi(2) scalar-tensor gravity model. These compact objects are made of a complex valued scalar field that has harmonic time dependence, while their space-time is static and they can reach densities and masses similar to that of supermassive black holes. We find that boson stars can be scalarized for both signs of the scalar-tensor coupling alpha and gamma, respectively. This is, in particular, true for boson stars that are a priori stable with respect to decay into individual bosonic particles. A fundamental difference between the alpha- and gamma-scalarization exists, though: while we find an interval in alpha > 0 for which boson stars can never be scalarized when gamma = 0, there is no restriction on gamma not equal 0 when alpha = 0. Typically, two branches of solutions exist that differ in the way the boson star gets scalarized: either the scalar field is maximal at the center of the star, or on a shell with finite radius which roughly corresponds to the outer radius of the boson star. We also demonstrate that the former solutions can be radially excited. (AU)

FAPESP's process: 19/01511-5 - Black holes and solitons in generalized scalar-tensor gravity models
Grantee:Betti Hartmann
Support type: Regular Research Grants
FAPESP's process: 16/12605-2 - (In)stability and excitation of modes in (asymptotically) Anti-de Sitter space-times with view to the AdS/CFT correspondence
Grantee:Betti Hartmann
Support type: Regular Research Grants