Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrum
Abstract Neutron stars are natural laboratories for testing gravity in the strong field regime. That is why the full spectrum of neutron star solutions in different modified theories should be thoroughly studied. Among the most natural modifications of general relativity are the theories in which ad...
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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/s10052-024-13704-7 |
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| author | Kalin V. Staykov Peter Y. Yordanov Daniela D. Doneva Stoytcho S. Yazadjiev |
| author_facet | Kalin V. Staykov Peter Y. Yordanov Daniela D. Doneva Stoytcho S. Yazadjiev |
| author_sort | Kalin V. Staykov |
| collection | DOAJ |
| description | Abstract Neutron stars are natural laboratories for testing gravity in the strong field regime. That is why the full spectrum of neutron star solutions in different modified theories should be thoroughly studied. Among the most natural modifications of general relativity are the theories in which additional scalar degrees of freedom are present. That is why scalar-tensor theories like Brans–Dicke and Damour–Esposito–Farese theories, as well as their extensions such as scalar-Gauss–Bonnet gravity, attracted attention throughout the years. In the present work, we combine those theory families and explore extensively the neutron star solution space in their realm. We identify qualitative new behavior of the solutions, including the existence of new types of phase transitions and new branches of solutions present only for high neutron star masses. Due to the peculiarities of the solutions, they can not be easily mimicked by a simple change of the equation of state. |
| format | Article |
| id | doaj-art-cf7a152493da4ce49b20dd14a6086cc2 |
| 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-cf7a152493da4ce49b20dd14a6086cc22025-02-02T12:39:00ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-12-01841211310.1140/epjc/s10052-024-13704-7Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrumKalin V. Staykov0Peter Y. Yordanov1Daniela D. Doneva2Stoytcho S. Yazadjiev3Department of Theoretical Physics, Faculty of Physics, Sofia UniversityDepartment of Theoretical Physics, Faculty of Physics, Sofia UniversityTheoretical Astrophysics, Eberhard Karls University of TübingenDepartment of Theoretical Physics, Faculty of Physics, Sofia UniversityAbstract Neutron stars are natural laboratories for testing gravity in the strong field regime. That is why the full spectrum of neutron star solutions in different modified theories should be thoroughly studied. Among the most natural modifications of general relativity are the theories in which additional scalar degrees of freedom are present. That is why scalar-tensor theories like Brans–Dicke and Damour–Esposito–Farese theories, as well as their extensions such as scalar-Gauss–Bonnet gravity, attracted attention throughout the years. In the present work, we combine those theory families and explore extensively the neutron star solution space in their realm. We identify qualitative new behavior of the solutions, including the existence of new types of phase transitions and new branches of solutions present only for high neutron star masses. Due to the peculiarities of the solutions, they can not be easily mimicked by a simple change of the equation of state.https://doi.org/10.1140/epjc/s10052-024-13704-7 |
| spellingShingle | Kalin V. Staykov Peter Y. Yordanov Daniela D. Doneva Stoytcho S. Yazadjiev Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrum European Physical Journal C: Particles and Fields |
| title | Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrum |
| title_full | Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrum |
| title_fullStr | Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrum |
| title_full_unstemmed | Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrum |
| title_short | Neutron stars in extended scalar-Gauss–Bonnet gravity: the richness of the solution spectrum |
| title_sort | neutron stars in extended scalar gauss bonnet gravity the richness of the solution spectrum |
| url | https://doi.org/10.1140/epjc/s10052-024-13704-7 |
| work_keys_str_mv | AT kalinvstaykov neutronstarsinextendedscalargaussbonnetgravitytherichnessofthesolutionspectrum AT peteryyordanov neutronstarsinextendedscalargaussbonnetgravitytherichnessofthesolutionspectrum AT danieladdoneva neutronstarsinextendedscalargaussbonnetgravitytherichnessofthesolutionspectrum AT stoytchosyazadjiev neutronstarsinextendedscalargaussbonnetgravitytherichnessofthesolutionspectrum |