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Evolving black hole horizons in General Relativity and alternative gravity
Valerio Faraoni
From the microscopic point of view, realistic black holes are time-dependent and the teleological concept of event horizon fails. At present, the apparent or the trapping horizon s…
Conformally coupled inflation
Valerio Faraoni
A massive scalar field in a curved spacetime can propagate along the light cone, a causal pathology, which can, in principle, be eliminated only if the scalar couples conformally t…
Absence of scalar hair in scalar-tensor gravity
Valerio Faraoni, Thomas P. Sotiriou
Stationary, asymptotically flat black holes in scalar-tensor theories of gravity are studied. It is shown that such black holes have no scalar hair and are the same as in General R…
Apparent horizons in Clifton-Mota-Barrow inhomogeneous universe
Vincenzo Vitagliano, Valerio Faraoni, Thomas P. Sotiriou +1
We analyze the apparent horizon dynamics in the inhomogeneous Clifton-Mota-Barrow solution of Brans-Dicke theory. This solution models a central matter configuration embedded in a…