32 citations · 134 across the 13 of their papers we have counts for
13 papers
Relativistic modeling of cosmological structures with Bianchi IX spacetimes
Przemyslaw Malkiewicz, Jan J. Ostrowski, Ismael Delgado Gaspar
We develop a relativistic framework to investigate the evolution of cosmological structures from the initial density perturbations to the highly nonlinear regime. Our approach invo…
Growth rate of spherical voids with non-comoving Dark Matter and Baryons
Fernando A. Pizaña, Juan Carlos Hidalgo, Ismael Delgado Gaspar +1
We present numerical solutions to Einstein's equations describing large spherical cosmic voids constituted by two components; dark matter and baryons, with a non-vanishing initial…
Beyond relativistic Lagrangian perturbation theory. I. An exact-solution controlled model for structure formation
Ismael Delgado Gaspar, Thomas Buchert, Jan J. Ostrowski
We develop a new nonlinear method to model structure formation in general relativity from a generalization of the relativistic Lagrangian perturbation schemes, controlled by Szeker…
On general-relativistic Lagrangian perturbation theory and its non-perturbative generalization
Thomas Buchert, Ismael Delgado Gaspar, Jan J. Ostrowski
The Newtonian Lagrangian perturbation theory is a widely used framework to study structure formation in cosmology in the nonlinear regime. We review a general-relativistic formulat…
Lagrangian theory of structure formation in relativistic cosmology. VI. Comparison with Szekeres exact solutions
Ismael Delgado Gaspar, Thomas Buchert
We examine the relation between the Szekeres models and relativistic Lagrangian perturbation schemes, in particular the Relativistic Zel'dovich Approximation (RZA). We show that th…
Non-comoving baryons and cold dark matter in cosmic voids
Ismael Delgado Gaspar, Juan Carlos Hidalgo, Roberto A. Sussman
We examine the fully relativistic evolution of cosmic voids constituted by baryons and cold dark matter (CDM), represented by two non-comoving dust sources in a CDM background.…
Black hole formation from the gravitational collapse of a non-spherical network of structures
Ismael Delgado Gaspar, Juan Carlos Hidalgo, Roberto A. Sussman +1
We examine the gravitational collapse and black hole formation of multiple non--spherical configurations constructed from Szekeres dust models with positive spatial curvature that…
Non-Spherical Szekeres models in the language of Cosmological Perturbations
Roberto A. Sussman, Juan Carlos Hidalgo, Ismael Delgado Gaspar +1
We study the differences and equivalences between the non-perturbative description of the evolution of cosmic structure furnished by the Szekeres dust models (a non-spherical exact…
Multiple non-spherical structures from the extrema of Szekeres scalars
Roberto A. Sussman, Ismael Delgado Gaspar
We examine the spatial extrema (local maxima, minima and saddle points) of the covariant scalars (density, Hubble expansion, spatial curvature and eigenvalues of the shear and elec…
Coarse-grained description of cosmic structure from Szekeres models
Roberto A. Sussman, I. Delgado Gaspar, Juan Carlos Hidalgo
We show that the full dynamical freedom of the well known Szekeres models allows for the description of elaborated 3--dimensional networks of cold dark matter structures (over--den…
A non-perturbative study of the evolution of cosmic magnetised sources
I. Delgado Gaspar, A. Pérez Martínez, G. Piccinelli +1
We undertake a hydrodynamical study of a mixture of tightly coupled primordial radiation, neutrinos, baryons, electrons and positrons, together with a gas of already decoupled dark…
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…
Gravity induced evolution of a magnetized fermion gas with finite temperature
I. Delgado Gaspar, A. Perez Martinez, Roberto A. Sussman +1
We examine the near collapse dynamics of a self-gravitating magnetized electron gas at finite temperature, taken as the source of a Bianchi-I spacetime described by the Kasner metr…