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A Metric for Gravitational Collapse Around a Schwarzschild Black Hole
(World Scientific Publishing, 2023) Erdem, Recai; Demirkaya, Betül; Gültekin, Kemal
We consider the problem of gravitational collapse of a fluid under the effect of a small Schwarzschild black hole (e.g. a primordial one). We assume the fluid initially may be approximated by a uniform homogeneous dust. Starting from this configuration we obtain a class of metrics under some physically justified assumptions. We find that the metric we obtain includes the dust collapse as a subcase. After discussing some basic properties of the solution, we discuss the case of dust collapse in more detail. We find that the radial and tangential pressures outside the horizon may take positive or negative values depending on the values of the parameters.
Can Cpt Be Violated Through Extended Time Reversal?
(World Scientific Publishing, 2001) Erdem, Recai; Ufuktepe, Ünal
We consider the implications of the extension of time reversal through Wigner types and group extensions. We clarify its physical content and apply the results in a toy model. Finally we point out the possibility of violation of CPT in this framework.

Physics / Fizik