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17 papers · 1 filter
Modified Rindler acceleration as a nonlinear electromagnetic effect
M. Halilsoy, O. Gurtug, S. Habib Mazharimousavi
The model proposed originally by Mannheim and Kazanas for fitting the shapes of galactic rotation curves has recently been considered by Grumiller to describe gravity of a central…
Unified Bertotti-Robinson and Melvin Spacetimes
M. Halilsoy, S. Habib Mazharimousavi
We present a solution for the Einstein-Maxwell (EM) equations which unifies both the magnetic Bertotti-Robinson (BR) and Melvin (ML) solutions as a single metric in the axially sym…
Comment on "Static and spherically symmetric black holes in f(R) theories"
S. Habib Mazharimousavi, M. Halilsoy
We consider the interesting "near-horizon test" reported in (PRD84, 084006(2011), arXiv:1107.5727) for any static, spherically symmetric (SSS) black hole solution admitted in f(R)…
Existence of Reissner-Nordstrom type black holes in f(R) gravity
S. Habib Mazharimousavi, M. Kerachian, M. Halilsoy
We investigate the existence of Reissner-Nordström (RN) type black holes in f(R) gravity. Our emphasis is to derive, in the presence of electrostatic source, the necessary conditio…
Investigation of Hill Cipher Modifications Based on Permutation and Iteration
Mina Farmanbar, Alexander G. Chefranov
Two recent Hill cipher modifications which iteratively use interweaving and interlacing are considered. We show that strength of these ciphers is due to non-linear transformation u…
Necessary conditions for having wormholes in f(R) gravity
S. Habib Mazharimousavi, M. Halilsoy
For a generic which admits a polynomial expansion of at least third order (i.e. ) we find the near-throat wormhole solution. Necessary condition…