Browsing by Author "Jamil, M."
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ArticlePublication Metadata only Overcharging dilaton black holes in (2+1) dimensions to extremality and beyond(World Scientific Publishing Co Pte Lt, 2020-12) Düztaş, Koray; Jamil, M.; Natural and Mathematical Sciences; DÜZTAŞ, KorayWe test whether static charged dilaton black holes in (2 + 1) dimensions can be turned into naked singularities by sending in test particles from infinity. We derive that overcharging is possible and generic for both extremal and nearly extremal black holes. Our analysis also implies that nearly extremal charged dilaton black holes can be continuously driven to extremality and beyond, unlike nearly extremal Banados-Teitelboim-Zanelli, Kerr and Reissner-Nordstrom black holes which are overspun or overcharged by a discrete jump. Thus, the weak form of the cosmic censorship conjecture and the third law of black hole thermodynamics are both violated in the interaction of charged dilaton black holes in (2 + 1) dimensions, with test particles. We also derive that there exist no points, where the heat capacity vanishes or diverges in the transition from black holes to naked singularities. The phase transitions that could potentially prevent the formation of naked singularities do not occur.ArticlePublication Open Access String analog of Reissner–Nordström black holes cannot be overcharged(World Scientific Publishing Co Pte Lt, 2019-09-28) Düztaş, Koray; Jamil, M.; Natural and Mathematical Sciences; DÜZTAŞ, KorayIn this work, we attempt to overcharge extremal and nearly extremal charged black holes in string theory, known as the Garfinkle-Horowitz-Strominger solution. We first show that extremal black holes cannot be overcharged analogous to the case of Reissner-Nordstrom (RN) black holes. Contrary to their analog in general relativity, nearly extremal black holes can neither be overcharged beyond extremality, nor can they be driven to extremality by the interaction with test particles. Therefore, the analysis in this work also implies that the third law of black hole thermodynamics holds for the relevant charged black holes in string theory perturbed by test particles. This can be interpreted as a stronger version of the third law since one can drop out the continuity proviso for the relevant process.ArticlePublication Metadata only Testing cosmic censorship conjecture for extremal and near-extremal (2 + 1)-dimensional MTZ black holes(IOP Publishing, 2020-09-03) Düztaş, Koray; Jamil, M.; Shaymatov, S.; Ahmedov, B.; Natural and Mathematical Sciences; DÜZTAŞ, KorayWe test the validity of the weak cosmic censorship conjecture for the (2 + 1)-dimensional charged anti-de Sitter black hole solution, which was derived by Martinezet al(MTZ). We first construct a thought experiment by throwing test charged particles on an extremal MTZ black hole. We derive that extremal (2 + 1) dimensional black holes can be overcharged by test particles, unlike their analogues in (3 + 1) and higher dimensions. Nearly-extremal MTZ black holes can also be overcharged, by a judicious choice of energy and charge for the test particles when the second order effects are ignored. We also incorporate the second order effects for nearly extremal MTZ black holes by adapting the method developed by Sorce and Wald. However it turns out that the second order effects cannot compensate for the overcharging of MTZ black holes.