4 papers
The effect of a distribution potential on a quantum mechanical particle in a box
Pedro Martins Girão, João Pedro Nunes
We study the effect of a distribution potential placed at and multiplied by a parameter on a quantum mechanical particle in an infinite square well over the seg…
Regularity of a double null coordinate system for Kerr-Newman-de Sitter spacetimes
Anne T. Franzen, Pedro M. Girão
We construct a double null coordinate system for Kerr-Newman-de Sitter spacetimes and prove that the two-spheres given by the intersection of the hypersurfa…
Solutions of the wave equation bounded at the Big Bang
Pedro M. Girão, José Natário, Jorge Drumond Silva
By solving a singular initial value problem, we prove the existence of solutions of the wave equation which are bounded at the Big Bang in the Friedmann-Lemaitre-Robert…
On the occurrence of mass inflation for the Einstein-Maxwell-scalar field system with a cosmological constant and an exponential Price law
João L. Costa, Pedro M. Girão, José Natário +1
In this paper we study the spherically symmetric characteristic initial data problem for the Einstein-Maxwell-scalar field system with a positive cosmological constant in the inter…