Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features
Abstract Spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theory admits both vacuum-general relativity (GR) and scalarized hairy black holes as valid solutions, which provides a distinctive signature of new physics in strong gravity regime. In this paper, we shall examine the optical featur...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-12-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-13612-w |
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| author | Xi-Jing Wang Yuan Meng Xiao-Mei Kuang Kai Liao |
| author_facet | Xi-Jing Wang Yuan Meng Xiao-Mei Kuang Kai Liao |
| author_sort | Xi-Jing Wang |
| collection | DOAJ |
| description | Abstract Spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theory admits both vacuum-general relativity (GR) and scalarized hairy black holes as valid solutions, which provides a distinctive signature of new physics in strong gravity regime. In this paper, we shall examine the optical features of Gauss–Bonnet black holes with spontaneous scalarization, which is governed by the coupling parameter $$\lambda $$ λ . We find that the photon sphere, critical impact parameter and innermost stable circular orbit all decrease as the increasing of $$\lambda $$ λ . Using observable data from Event Horizon Telescope, we establish the upper limit for $$\lambda $$ λ . Then we construct the optical appearances of the scalarized black holes illuminated by various thin accretions. Our findings reveal that the scalarized black holes consistently exhibit smaller shadow sizes and reduced brightness compared to Schwarzschild black holes. Notably, in the case of thin spherical accretion, the shadow of the scalarized black hole is smaller, but the surrounding bright ring is more pronounced. Our results highlight the observable features of the scalarized black holes, providing a distinguishable probe from their counterpart in GR in strong gravity regime. |
| format | Article |
| id | doaj-art-f43c13be31a744628cf693c13fe0db8e |
| institution | Kabale University |
| issn | 1434-6052 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-f43c13be31a744628cf693c13fe0db8e2025-02-02T12:39:13ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-12-01841211510.1140/epjc/s10052-024-13612-wDistinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical featuresXi-Jing Wang0Yuan Meng1Xiao-Mei Kuang2Kai Liao3Department of Astronomy, School of Physics and Technology, Wuhan UniversityCenter for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou UniversityCenter for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou UniversityDepartment of Astronomy, School of Physics and Technology, Wuhan UniversityAbstract Spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theory admits both vacuum-general relativity (GR) and scalarized hairy black holes as valid solutions, which provides a distinctive signature of new physics in strong gravity regime. In this paper, we shall examine the optical features of Gauss–Bonnet black holes with spontaneous scalarization, which is governed by the coupling parameter $$\lambda $$ λ . We find that the photon sphere, critical impact parameter and innermost stable circular orbit all decrease as the increasing of $$\lambda $$ λ . Using observable data from Event Horizon Telescope, we establish the upper limit for $$\lambda $$ λ . Then we construct the optical appearances of the scalarized black holes illuminated by various thin accretions. Our findings reveal that the scalarized black holes consistently exhibit smaller shadow sizes and reduced brightness compared to Schwarzschild black holes. Notably, in the case of thin spherical accretion, the shadow of the scalarized black hole is smaller, but the surrounding bright ring is more pronounced. Our results highlight the observable features of the scalarized black holes, providing a distinguishable probe from their counterpart in GR in strong gravity regime.https://doi.org/10.1140/epjc/s10052-024-13612-w |
| spellingShingle | Xi-Jing Wang Yuan Meng Xiao-Mei Kuang Kai Liao Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features European Physical Journal C: Particles and Fields |
| title | Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features |
| title_full | Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features |
| title_fullStr | Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features |
| title_full_unstemmed | Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features |
| title_short | Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features |
| title_sort | distinguishing black holes with and without spontaneous scalarization in einstein scalar gauss bonnet theories via optical features |
| url | https://doi.org/10.1140/epjc/s10052-024-13612-w |
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