315 citations · 333 across the 8 of their papers we have counts for
16 papers · 1 filter
Global existence for a Fritz John equation in expanding FLRW spacetimes
João L. Costa, Jesús Oliver, Flavio Rossetti
We study the family of semilinear wave equations , on fixed expanding FLRW spacetimes, having spatial slices and undergoing…
Message in a bottle: energy extraction from bouncing geometries
Vitor Cardoso, João L. Costa, José Natário +1
Quantum gravity phenomenology suggests the interesting possibility that black holes are not eternal. Collapse could be halted by some unknown mechanism, or Hawking radiation might…
Improved decay estimates and -asymptotic stability of solutions to the Einstein-scalar field system in spherical symmetry
João L. Costa, Rodrigo Duarte, Filipe C. Mena
We investigate the asymptotic stability of solutions to the characteristic initial value problem for the Einstein (massless) scalar field system with a positive cosmological consta…
Semilinear wave equations on accelerated expanding FLRW spacetimes
João L. Costa, Anne T. Franzen, Jesús Oliver
We identify a large class of systems of semilinear wave equations, on fixed accelerated expanding FLRW spacetimes, with nearly at spatial slices, for which we prove small data futu…
Addendum to "Strong cosmic censorship: The nonlinear story"
Raimon Luna, Miguel Zilhão, Vitor Cardoso +2
We clarify a number of issues that arise when extending the analysis of Strong Cosmic Censorship (SCC) to perturbations of highly charged Reissner-Nordström de Sitter (RNdS) spacet…
The formation of trapped surfaces in the gravitational collapse of spherically symmetric scalar fields with a positive cosmological constant
João L. Costa
Given spherically symmetric characteristic initial data for the Einstein-scalar field system with a positive cosmological constant, we provide a criterion, in terms of the dimensio…