Challenging the cosmic censorship in Einstein-Maxwell-scalar theory with numerically simulated gedankenexperiments

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online (only)
Fabrizio Corelli (Sapienza University of Rome)

According to the Penrose's cosmic censorship conjecture, curvature singularities in General Relativity are always hidden by an horizon. This implies that the charge-to-mass ratio of a spherically symmetric charged black hole in Einstein-Maxwell theory cannot be larger than one.

In this talk I will show the results of extensive numerical simulations at fully-nonlinear level of the spherical collapse of (charged) wavepackets onto a charged black hole. The aim of the simulations is to study the possibility of forming naked singularities in Einstein-Maxwell theory and in Einstein-Maxwell-scalar theory with quadratic coupling. In both cases no violations of the cosmic censorship conjecture occur, although in Einstein-Maxwell-scalar theory overcharged scalarized black hole solutions can exist.

I will discuss the crucial role played by superradiance in preventing the black hole from reaching extremality, and the dynamical formation of a Reissner-Nordström black hole from a scalarized one. In particular I will show how this "descalarization" process can be induced either by superradiance or by absorption of an opposite-charged wavepacket.


Zoom Meeting ID: 852 8915 0495

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