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Gravitational entropies in LTB dust models
Roberto A Sussman, Julien Larena
We consider generic Lemaitre-Tolman-Bondi (LTB) dust models to probe the gravitational entropy proposals of Clifton, Ellis and Tavakol (CET) and of Hosoya and Buchert (HB). We also…
Invariant characterization of the growing and decaying density modes in LTB dust models
Roberto A Sussman
We obtain covariant expressions that generalize the growing and decaying density modes of linear perturbation theory of dust sources by means of the exact density perturbation from…
Gravitational collapse of a magnetized fermion gas with finite temperature
I. Delgado Gaspar, A. Perez Martinez, Roberto A. Sussman +1
We examine the dynamics of a self--gravitating magnetized electron gas at finite temperature near the collapsing singularity of a Bianchi-I spacetime. Considering a general and app…
Weighed scalar averaging in LTB dust models, part II: a formalism of exact perturbations
Roberto A. Sussman
We examine the exact perturbations that arise from the q-average formalism that was applied in the preceding article (part I) to Lemaitre-Tolman-Bondi (LTB) models. By introducing…