4 papers
On the geometrical and dynamical distinction between Unimodular and General Relativistic wormholes
Marco Bosquez, Erick Pastén, Mauricio Cataldo +1
We characterize traversable wormholes in Unimodular Gravity (UG) and investigate what distinguishes them from their General Relativistic (GR) counterparts. For a class of static an…
Null Raychaudhuri Equation and the Impossibility of Traversable Wormholes in Unimodular Gravity
Erick Pastén, Marco Bosquez, Norman Cruz
We formulate the traversability of wormhole throats as a local and covariant null defocusing condition derived from the Raychaudhuri equation. Since unimodular gravity preserves th…
The reason peculiar velocities grow faster in general relativity than in Newtonian gravity
Erick Pastén, Christos Tsagas
An increasing number of surveys has been reporting large-scale peculiar motions with sizes and speeds in excess of those allowed by the concordance cosmological model. These are th…
Redshift Dipoles from Non-Geodesic Observer Congruences in Covariant Cosmology
Erick Pastén, Erick Pastén
Recent analyses of large-scale structure and redshift surveys have reported significant dipolar anisotropies in the local Universe that are not straightforwardly attributable to a…