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Covariantizing the interaction between dark energy and dark matter
Valerio Faraoni, James B. Dent, Emmanuel N. Saridakis
Coupling dark energy and dark matter through an effective fluid description is a very common procedure in cosmology, however it always remains in comoving coordinates in the specia…
The charged McVittie spacetime
Valerio Faraoni, Andres F. Zambrano Moreno, Angus Prain
The two-parameter charged McVittie solution of the Einstein equations is revisited and its apparent horizons are discussed and located numerically (for the extremal case, analytica…
Are there really `black holes' in the Atlantic Ocean?
Angus Prain, Valerio Faraoni
In this letter we point out some interpretational difficulties associated with concepts from General Relativity in a recent article which appeared in J. Fluid Mech. 731 (2013) R4 w…
Horizon thermodynamics and spacetime mappings
Valerio Faraoni, Vincenzo Vitagliano
When black holes are dynamical, event horizons are replaced by apparent and trapping horizons. Conformal and Kerr-Schild transformations are widely used in relation with dynamical…