Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar Condition
We model the light HESS J1731-347 compact object (of known stellar mass and radius) within Einstein’s General Relativity, imposing the Karmarkar condition in gravity for anisotropic stars. The three free parameters of the analytic solution are determined by imposing the matching conditions at the su...
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2025-05-01
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| author | Grigoris Panotopoulos |
| author_facet | Grigoris Panotopoulos |
| author_sort | Grigoris Panotopoulos |
| collection | DOAJ |
| description | We model the light HESS J1731-347 compact object (of known stellar mass and radius) within Einstein’s General Relativity, imposing the Karmarkar condition in gravity for anisotropic stars. The three free parameters of the analytic solution are determined by imposing the matching conditions at the surface of the star for objects of known stellar mass and radius. Finally, using well-established criteria, it is shown that the solution is compatible with all requirements for well-behaved and realistic solutions. Furthermore, we study the radial oscillation modes, and we compare them to the ones corresponding to an isotropic star modeled by the Tolman IV exact analytic solution obtained a long time ago. A comparison between the large frequency separations is made as well. |
| format | Article |
| id | doaj-art-7e40566f655a40bbaf4d35f966cc35e3 |
| institution | DOAJ |
| issn | 2218-1997 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
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| series | Universe |
| spelling | doaj-art-7e40566f655a40bbaf4d35f966cc35e32025-08-20T03:12:09ZengMDPI AGUniverse2218-19972025-05-0111514610.3390/universe11050146Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar ConditionGrigoris Panotopoulos0Departamento de Ciencias Físicas, Universidad de la Frontera, Casilla 54-D, Temuco 4811186, ChileWe model the light HESS J1731-347 compact object (of known stellar mass and radius) within Einstein’s General Relativity, imposing the Karmarkar condition in gravity for anisotropic stars. The three free parameters of the analytic solution are determined by imposing the matching conditions at the surface of the star for objects of known stellar mass and radius. Finally, using well-established criteria, it is shown that the solution is compatible with all requirements for well-behaved and realistic solutions. Furthermore, we study the radial oscillation modes, and we compare them to the ones corresponding to an isotropic star modeled by the Tolman IV exact analytic solution obtained a long time ago. A comparison between the large frequency separations is made as well.https://www.mdpi.com/2218-1997/11/5/146compact objectsexact solutionsasteroseismologyradial oscillations |
| spellingShingle | Grigoris Panotopoulos Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar Condition Universe compact objects exact solutions asteroseismology radial oscillations |
| title | Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar Condition |
| title_full | Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar Condition |
| title_fullStr | Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar Condition |
| title_full_unstemmed | Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar Condition |
| title_short | Radial Oscillations of the HESS J1731-347 Compact Object Imposing the Karmarkar Condition |
| title_sort | radial oscillations of the hess j1731 347 compact object imposing the karmarkar condition |
| topic | compact objects exact solutions asteroseismology radial oscillations |
| url | https://www.mdpi.com/2218-1997/11/5/146 |
| work_keys_str_mv | AT grigorispanotopoulos radialoscillationsofthehessj1731347compactobjectimposingthekarmarkarcondition |