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gr-qc2024
Asymptotics of Bianchi IX under the presence of matter: approximate Kasner map
David Brizuela, Sara F. Uria
The goal of this paper is to analyze the effects of the matter fields in the evolution of the Bianchi IX cosmology close to the singularity. Although the dynamics of this model is…
gr-qc2024
Perturbations of bimetric gravity on most general spherically symmetric spacetimes
David Brizuela, Marco de Cesare, Araceli Soler Oficial
We present a formalism to study linear perturbations of bimetric gravity on any spherically symmetric background, including dynamical spacetimes. The setup is based on the Gerlach-…