2 papers
gr-qc2016
Geometrical models for the study of astrophysical systems with spheroidal symmetry imbedded in a standard cosmology: The case of cosmic voids
Ezequiel F. Boero, Osvaldo M. Moreschi
We present a class of general prolate and oblate spheroidal spacetimes for the description of cosmic structures in the Universe. They are exact geometries which represent, in an ap…
gr-qc2016
Practical definition of averages of tensors in general relativity
Ezequiel F. Boero, Osvaldo M. Moreschi
We present a definition of tensor fields which are average of tensors over a manifold, with a straightforward and natural definition of derivative for the averaged fields; which in…