6 papers
Dual entropy gain by radiation at the zero temperature limit
Koray Düztaş
Recently we have demonstrated that black hole radiation can be smoothly extended to the zero-temperature limit. Here we analyse entropy variations at the zero temperature limit and…
The generalized second law for fermionic and bosonic fields
Koray DüztaÅ
We evaluate the validity of the generalied second law for Kerr black holes perturbed by fermionic and bosonic fields. We derive that the critical frequency for a test field below w…
Self energy in Kerr-Sen space-time incorporated to overspinning and overcharging problems
Koray DüztaÅ
Previous attempts to overspin or overcharge Kerr-Sen black holes have been incomplete, as they neglect back-reaction effects. In this study, we incorporate the self-energy of pertu…
Hawking radiation at the zero temperature limit
Koray DüztaÅ
We show that the thermal radiation derived by Hawking can be smoothly extended to the limit for Kerr black holes. The emission of the modes with comes to a halt as…
Spin-2 fields and cosmic censorship
Koray DüztaÅ
We evaluate the possibility of the formation of naked singularities in the interaction of Kerr black holes with test massless spin-2 fields. We analyse the scattering problem for b…
Can the induced increase in the angular velocity prevent the overspinning of BTZ black holes?
Koray DüztaÅ
Previously we showed that nearly extremal Bañados-Teitelboim-Zanelli (BTZ) black holes can be overspun by test bodies and fields, following the work of Rocha and Cardoso for the e…