107 research outputs found
Modeling compact objects with quark matter and dark energy: A comparative study of the radial oscillation modes of HESS J1731-347 and PSR J0740+6620
No full textLos autores declaran los siguientes intereses financieros/relaciones personales que pueden considerarse como posibles intereses en competencia: Grigorios Panotopoulos informa una relación con la Universidad de la Frontera que incluye: empleo. Si hay otros autores, declaran que no tienen intereses financieros en conflicto o relaciones personales conocidas que podrían haber influido en el trabajo presentado en este artículo
Anisotropic stars in 4D Einstein-Gauss-Bonnet gravity
No full textWe wish to thank the anonymous reviewer for comments and suggestions. The author T. T would like to thank the financial support from the Science Achievement Scholarship of Thailand (SAST) . A. Pradhan thanks to IUCCA, Pune, India for providing fa-cilities under associateship programmes. The author G. P. thanks the FundacAo para a Ciencia e Tecnologia (FCT) , Portugal, for the financial support to the Center for Astrophysics and Gravitation-CENTRA, Chile, Instituto Superior Tecnico, Universidade de Lis-boa, Portugal, through the Project No. UIDB/00099/2020 and No. PTDC/FIS-AST/28920/2017
Orbits of light rays in (1+2)-dimensional Einstein-power-Maxwell gravity: Exact analytical solution to the null geodesic equations
No full textSlowly rotating dark energy stars
No full textWe thank the anonymous reviewer for useful comments and suggestions. The authors G.P. and I.L. thank the Fundacao para a Ciencia e Tecnologia (FCT), Portugal, for the financial support to the Center for Astrophysics and Gravitation-CENTRA, Instituto Superior Tecnico, Universidade de Lisboa, through the Grants No. UID/FIS/00099/2013 and No. PTDC/FIS-AST/28920/2017. The author A.R. acknowledges Universidad de Tarapaca for financial support
On new regular charged black hole solutions: Limiting Curvature Condition, Quasinormal modes and Shadows
No full textTakol Tangphati recibió el apoyo de la Universidad de Walailak en el marco del plan de desarrollo de nuevos investigadores, Tailandia (número de contrato WU67268)
Stellar Modeling via the Tolman IV Solution: The Cases of the Massive Pulsar J0740+6620 and the HESS J1731-347 Compact Object
No full textWe model compact objects of known stellar mass and radius made of isotropic matter within Einstein’s gravity. The interior solution describing hydrostatic equilibrium we are using throughout the manuscript corresponds to the Tolman IV exact analytic solution obtained a long time ago. The three free parameters of the solutions are determined by imposing the matching conditions for objects of known stellar mass and radius. Finally, using well established criteria, it is shown that, contrary to the Kohler Chao solution, the Tolman IV solution is compatible with all requirements for well-behaved and realistic solutions, except for the relativistic adiabatic index that diverges at the surface of stars. The divergence of the index Γ may be resolved, including a thin crust assuming a polytropic equation of state, which is precisely the case seen in studies of neutron stars. To the best of our knowledge, we model here for the first time the recently discovered massive pulsar PSR J0740+6620 and the strangely light HESS compact object via the Tolman IV solution. The present work may be of interest to model builders as well as a useful reference for future research
Regular Charged Black Holes, Energy Conditions, and Quasinormal Modes
No full textEl autor A.R. está financiado por el contrato María Zambrano ZAMBRANO 21-25 (España) (con financiación de NextGenerationEU). El autor L.B. cuenta con el apoyo de DIUFRO a través del proyecto: DI22-0026
Quark models and radial oscillations: decoding the HESS J1731-347 compact object's equation of state
No full textThermodynamics of the quantum Schwarzschild black hole
No full textDeseamos agradecer al árbitro anónimo por su crítica constructiva así como por sus útiles comentarios y sugerencias. A. R. agradece el apoyo económico de la Generalitat Valenciana a través del PROYECTO PROMETEO CIPROM/2022/13. A. R. está financiado por el contrato María Zambrano ZAMBRANO 21-25 (España). El autor L. B. cuenta con el apoyo de DIUFRO a través del proyecto: DI22-0026
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