Fernando A. Pizaña
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View article: Gravitational entropy of fluids with energy flux
Gravitational entropy of fluids with energy flux Open
We examine gravitational entropy growth within the formalism of Clifton, Ellis and Tavakol (CET) applied to a class of spherically symmetric exact solutions whose source is a shear-free fluid with energy flux in a comoving frame. By consid…
View article: Growth rate of spherical voids with non-comoving dark matter and baryons
Growth rate of spherical voids with non-comoving dark matter and baryons Open
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 relative velocity, in an asymptotically homogeneous backgro…
View article: Growth rate of spherical voids with non-comoving Dark Matter and Baryons
Growth rate of spherical voids with non-comoving Dark Matter and Baryons Open
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 relative velocity, in an asymptotically homogeneous backgro…
View article: Gravitational entropy in Szekeres class I models
Gravitational entropy in Szekeres class I models Open
Developing a self-consistent notion of gravitational entropy in the context of cosmological structure formation has been so far an elusive task. Various theoretical proposals have been presented, initially based on Penrose’s Weyl curvature…
View article: Gravitational Entropy in Szekeres Class I Models
Gravitational Entropy in Szekeres Class I Models Open
Gravitational entropy is an elusive concept. Various theoretical proposals\nhave been presented, initially based on Penrose's Weyl Curvature Hypothesis,\nand variations of it. A more recent proposal by Clifton, Ellis, and Tavakol\n(CET) co…