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A dynamical study of the Eddington capture sphere

Grant number: 13/01001-0
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): June 01, 2013
Effective date (End): May 31, 2014
Field of knowledge:Physical Sciences and Mathematics - Physics - General Physics
Principal Investigator:Alberto Vazquez Saa
Grantee:Ronaldo Savioli Sumé Vieira
Supervisor abroad: Marek Artur Abramowicz
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Local de pesquisa : Polish Academy of Sciences (PAN), Poland  
Associated to the scholarship:10/00487-9 - Dynamical study of Newtonian and Post-Newtonian self-gravitating systems with dark matter, BP.DR


The general relativistic treatment of the radiation field of a spherically symmetric star introduces new features, which are absent in Newtonian gravity. One important result is the presence of the "Eddington Capture Sphere'', a radius for which the gravitational and radiation forces balance. This region is shown to be an attractor for the dynamics of test particles. We intent to deepen the analysis of motion around the Eddington Capture Sphere and improve the dynamical description of the system, investigating in more detail its time dependence. We also intent to analyze the effect that the radiation test field exerts on spacetime if we consider it as a source for Einstein's equations. Another topic to be analysed is the structure of the "Eddington Capture Surface" in the presence of an accretion disk around the star. (AU)

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VIEIRA, RONALDO S. S.; KLUZNIAK, WLODEK; ABRAMOWICZ, MAREK. Curvature dependence of relativistic epicyclic frequencies in static, axially symmetric spacetimes. Physical Review D, v. 95, n. 4 FEB 8 2017. Web of Science Citations: 1.
LASOTA, J. -P.; VIEIRA, R. S. S.; SADOWSKI, A.; NARAYAN, R.; ABRAMOWICZ, M. A. The slimming effect of advection on black-hole accretion flows. Astronomy & Astrophysics, v. 587, MAR 2016. Web of Science Citations: 15.
GOLUCHOVA, KATERINA; KULCZYCKI, KONRAD; VIEIRA, RONALDO S. S.; STUCHLIK, ZDENEK; KLUZNIAK, WLODEK; ABRAMOWICZ, MAREK. Horava's quantum gravity illustrated by embedding diagrams of the Kehagias-Sfetsos spacetimes. GENERAL RELATIVITY AND GRAVITATION, v. 47, n. 11 NOV 2015. Web of Science Citations: 2.
VIEIRA, RONALDO S. S.; SCHEE, JAN; KLUZNIAK, WLODEK; STUCHLIK, ZDENEK; ABRAMOWICZ, MAREK. Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Horava's gravity. Physical Review D, v. 90, n. 2 JUL 14 2014. Web of Science Citations: 24.

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