Conveners
Analytical and Numerical Approaches in Relativistic Physics
- Nelson Camilo Posada Aguirre
Linear perturbations of Robinson-Trautman radiative solutions with the
new nonlinear electrodynamics model are investigated. The results show
that unlike the solutions of Maxwell electrodynamics in the
Robinson-Trautman class, our new solutions are well-posed.
We demonstrate how the inclusion of a R^2 term and the use of the Palatini formalism allows models of inflation that have been excluded by the Planck data in their simplest realizations to become viable once again. We also discuss how the inclusion of a non-minimal derivative coupling term in the action allows the predictions of Palatini-Higgs inflation to be in contact with observations in...
Motivated by processes happening around accreting black holes,a series of papers entitled "Free motion around black holes with discs or rings: Between integrability and chaos" were published in order to classify and evaluate the chaotic behaviour that may occur in geodesic motion around static black holes if these are perturbed by gravity of some additional matter. However the static and...
In magnetized astrophysical plasma magnetic reconnection is the accepted mechanism that heats and accelerates plasmoids and affects the dynamics of the plasma. This is thought to be the mechanism for the dissipation of magnetic energy in the still poorly understood phenomena of solar flares, magnetic substorms in the Earth magnetosphere, jets, and relativistic ejections from the accretion...
We study shadows in the naked singularity spacetime, focusing on analytical studies, including the null naked singularity and naked singularity spacetime with quadrupole. We show that the Angular size of shadows in a different scenarios for the Schwarzschild black hole, null naked singularity and for the q-metric. The shadows of q-metric depends on the value of the quadrupole parameter.