Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory
Abstract In this work, we present a new type of scalar clouds supported by spherically symmetric horizonless compact objects in the scalar-Gauss–Bonnet theory. Unlike the previous spontaneous scalarization that is triggered by the tachyonic instability, our scalarization arises from a nonlinear inst...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-10-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-023-12144-z |
| _version_ | 1797247080400420864 |
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| author | Shao-Jun Zhang |
| author_facet | Shao-Jun Zhang |
| author_sort | Shao-Jun Zhang |
| collection | DOAJ |
| description | Abstract In this work, we present a new type of scalar clouds supported by spherically symmetric horizonless compact objects in the scalar-Gauss–Bonnet theory. Unlike the previous spontaneous scalarization that is triggered by the tachyonic instability, our scalarization arises from a nonlinear instability that is non-spontaneous. We explore two types of boundary conditions for the scalar field at the surface of the compact objects and find an infinite countable set of scalar clouds characterized by the number of nodes for both cases. Our study demonstrates that boundary conditions have a significant impact on the formation of scalar clouds. Specifically, for the Dirichlet boundary condition, scalarization is more likely to occur for compact objects with medium radii and becomes harder for ultra-compact and large ones. Conversely, for the Robin boundary condition, scalarization is easier for more compact objects. |
| first_indexed | 2024-03-11T16:46:27Z |
| format | Article |
| id | doaj.art-9baaec979aa04b6ea0ac42305c553409 |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-04-24T19:53:00Z |
| publishDate | 2023-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-9baaec979aa04b6ea0ac42305c5534092024-03-24T12:30:09ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522023-10-0183101710.1140/epjc/s10052-023-12144-zNonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theoryShao-Jun Zhang0Institute for Theoretical Physics and Cosmology, Zhejiang University of TechnologyAbstract In this work, we present a new type of scalar clouds supported by spherically symmetric horizonless compact objects in the scalar-Gauss–Bonnet theory. Unlike the previous spontaneous scalarization that is triggered by the tachyonic instability, our scalarization arises from a nonlinear instability that is non-spontaneous. We explore two types of boundary conditions for the scalar field at the surface of the compact objects and find an infinite countable set of scalar clouds characterized by the number of nodes for both cases. Our study demonstrates that boundary conditions have a significant impact on the formation of scalar clouds. Specifically, for the Dirichlet boundary condition, scalarization is more likely to occur for compact objects with medium radii and becomes harder for ultra-compact and large ones. Conversely, for the Robin boundary condition, scalarization is easier for more compact objects.https://doi.org/10.1140/epjc/s10052-023-12144-z |
| spellingShingle | Shao-Jun Zhang Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory European Physical Journal C: Particles and Fields |
| title | Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory |
| title_full | Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory |
| title_fullStr | Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory |
| title_full_unstemmed | Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory |
| title_short | Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory |
| title_sort | nonlinear instability and scalar clouds of spherical exotic compact objects in scalar gauss bonnet theory |
| url | https://doi.org/10.1140/epjc/s10052-023-12144-z |
| work_keys_str_mv | AT shaojunzhang nonlinearinstabilityandscalarcloudsofsphericalexoticcompactobjectsinscalargaussbonnettheory |