3 papers
gr-qc2026
Ultracompact Anisotropic Stars and Gravastars in General Relativity
Prajwal Hassan Puttasiddappa, Nora Bretón, Santiago Esteban Perez Bergliaffa
We study static, spherically symmetric ultracompact objects in General Relativity with anisotropic stress. Using the covariant anisotropic equation of state and assuming homogeneou…
gr-qc2026
Nonlinear electrodynamics in Kerr-Newman-NUT- spacetime: exact solutions, horizons, and energy conditions
Oscar Galindo-Uriarte, Nora Breton, Claus Lämmerzahl +1
We construct two exact nonlinear-electrodynamic generalizations of the Kerr-Newman-NUT- spacetime. Imposing alignment between the principal directions of the electromagnetic fie…
gr-qc2025
Four-function generalization and separable structures of the Plebanski spacetime with sources
Alfonso S. Acevedo, Nora Breton
We determine a four-function generalization of the Plebanski spacetime, depending on three arbitrary functions of the radial coordinate, and one function on the angular coordinate.…