IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Thin shells with spherical symmetry in F(R) theories (presentación oral, coautor)
Autor/es:
GRISELDA FIGUEROA AGUIRRE; ERNESTO F. EIROA
Lugar:
Córdoba
Reunión:
Conferencia; Grav19; 2019
Institución organizadora:
FAMAF, Universidad de Córdoba, Argentina
Resumen:
In order to provide alternatives to unsolved problems in modern cosmology, several theories that modify General Relativity were proposed, among them the F(R) theories of gravity. In these theories, the Einstein-Hilbert lagrangian is replaced by a function F(R) of the curvature scalar R. The junction formalism, recently extended to F(R) gravity, allows the study of the behavior of thin shells of matter by matching different solutions across a hypersurface. We present the construction of a broad class of spherical thin shells within F(R) gravity with a constant curvature scalar, and the corresponding stability analysis under perturbations preserving the symmetry. We show that the equation of state which relates the energy density with the pressure at the shell is forced by the junction conditions. We introduce some interesting examples in which stable configurations are possible for suitable values of the parameters.