Talk detail

Participant	Gutiérrez-Piñeres, Antonio C.
Institution	Universidad Tecnológica de Bolívar - Parque Industrial y Tecnológico Carlos Vélez Pombo, Km 1 vía a Turbaco, - Cartagena - Bolívar - Colombia

Session	GT4	Accepted	Yes	Order	7	Time	17:00 - 17:20
Talk	Oral abstract	Title	Electromagnetized disc-halo system in a conformastatic space-time
Co-authors	Guillermo A. González
Abstract	A detailed analysis of the surface energy-momentum tensor (SEMT) of thin discs with electromagnetized material exterior halo for a conformastatic space-time is presented. We consider the most general electromagnetized conformastatic thin disc-halo system with non-zero radial pressure and non-zero heat flow. The physical content of the energy-momentum tensor of the system is analyzed and expressions for the velocity vector, energy density, principal stresses and heat flow are obtained. Some simple thin disc models obtained from the Miyamoto solution are also presented.

Session	AT4	Accepted	No	Order	15	Time		15'
Talk	Oral abstract	Title	Exact solutions in metric $f(R)$ gravity for static axisymmetric spacetime
Co-authors	Guillermo A. González
Abstract	Axially symmetric static vacuum solution in Weyl coordinates are studied in $f(R)$ theories of gravity. In particular, we obtain the general explicit expression for the dependence between $df(R)/dR$ and the $r$ and $z$ coordinates and then the corresponding explicit form of $f(R)$. Next, we present in detail the explicit solution of the modified field equations corresponding to the Newtonian potential due to a punctual mass placed at the origin of coordinates and also the Schwarzschild solution to the modified field equations.