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The Campanelli-Lousto and veiled spacetimes
Luciano Vanzo, Sergio Zerbini, Valerio Faraoni
The Campanelli-Lousto solutions of Brans-Dicke theory, usually reported as black holes are reconsidered and shown to describe, according to the values of a parameter, wormholes or…
Scalar field cosmology in phase space
Valerio Faraoni, Charles S. Protheroe
Using dynamical systems methods, we describe the evolution of a minimally coupled scalar field and a Friedmann-Lemaitre-Robertson-Walker universe in the context of general relativi…
Are quantization rules for horizon areas universal?
Valerio Faraoni, Andres F. Zambrano Moreno
Doubts have been expressed on the universality of holographic/string-inspired quantization rules for the horizon areas of stationary black holes or the products of their radii, alr…
Interpreting the conformal cousin of the Husain-Martinez-Nunez solution
Valerio Faraoni, Andres F. Zambrano Moreno
A 2-parameter inhomogeneous cosmology in Brans-Dicke theory, obtained by conformally transforming the Husain-Martinez-Nunez (HMN) scalar field solution of the Einstein equations is…
Dynamical apparent horizons in inhomogeneous Brans-Dicke universes
Valerio Faraoni, Vincenzo Vitagliano, Thomas P. Sotiriou +1
The presence and evolution of apparent horizons in a two-parameter family of spherically symmetric, time-dependent solutions of Brans-Dicke gravity are analyzed. These solutions we…
Making sense of the bizarre behaviour of horizons in the McVittie spacetime
Valerio Faraoni, Andres F. Zambrano Moreno, Roshina Nandra
The bizarre behaviour of the apparent (black hole and cosmological) horizons of the McVittie spacetime is discussed using, as an analogy, the Schwarzschild-de Sitter-Kottler spacet…