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| Título: | Structure of neutron stars in R-squared gravity |
| Autor(es): | Orellana, Mariana Dominga García, Federico Teppa Pannia, Florencia A. Romero, Gustavo E. |
| Fecha de publicación: | 22-jun-2013 |
| Editorial: | Springer |
| Citación: | Orellana, Mariana D., García, Federico., Teppa Pannia, Florencia A. & Romero, Gustavo E. (2013). Structure of neutron stars in R-squared gravity. Springer; General Relativity And Gravitation; 45; 4; 771-783 |
| Revista: | General Relativity And Gravitation |
| Resumen: | The effects implied for the structure of compact objects by the modification of General Relativity produced by the generalization of the Lagrangian density to the form R plus alpha R-squared, where R is the Ricci curvature scalar, have been recently explored. It seems likely that this squared-gravity may allow heavier Neutron Stars (NSs) than GR. In addition, these objects can be useful to constrain free parameters of modified-gravity theories. The differences between alternative gravity theories is enhanced in the strong gravitational regime. In this regime, because of the complexity of the field equations, perturbative methods become a good choice to treat the problem. Following previous works in the field, we performed a numerical integration of the structure equations that describe NSs in f(R)-gravity, recovering their mass-radius relations, but focusing on particular features that arise from this approach in the profiles of the NS interior.We show that these profiles run in correlation with the second-order derivative of the analytic approximation to the Equation of State (EoS), which leads to regions where the enclosed mass decreases with the radius in a counter-intuitive way. We reproduce all computations with a simple polytropic EoS to separate zeroth-order modified gravity effects. |
| URI: | http://link.springer.com/article/10.1007%2Fs10714-013-1501-5 http://arxiv.org/abs/1301.5189 https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2831 |
| Identificador DOI: | http://dx.doi.org/10.1007/s10714-013-1501-5 |
| ISSN: | 0001-7701 |
| Aparece en las colecciones: | Artículos |
Archivos en este ítem:
| Archivo | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| Structure of neutron stars in R-squared gravity.pdf | 1,09 MB | Adobe PDF | Visualizar/Abrir |
Este documento es resultado del financiamiento otorgado por el Estado Nacional, por lo tanto queda sujeto al cumplimiento de la Ley N° 26.899
Esta obra está bajo una Licencia Creative Commons Atribución-NoComercial-CompartirIgual 4.0 Internacional.