228 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Middle East Technical UniversityTR19 papers
- Bilkent UniversityTR16 papers
- Usak UniversityTR5 papers
- University of KurdistanIR3 papers
- Ankara UniversityTR2 papers
- Centro de Estudios CientíficosCL2 papers
- Istanbul Technical UniversityTR2 papers
- University of GroningenNL2 papers
- Adana Science and Technology UniversityTR1 paper
- Aix-Marseille UniversitéFR1 paper
- Amasya ÜniversitesiTR1 paper
- Ankara Bilim Üniversitesi1 paper
45 papers
Almost Universal Metrics
Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin
A metric is called universal if every symmetric conserved rank-two tensor constructed locally from the metric, the curvature, and covariant derivatives of the curvature is proporti…
Weyl double copy in Lifshitz spacetimes
Gokhan Alkac, Mehmet Kemal Gumus, Mehmet Ali Olpak
Lifshitz black hole solutions pose particular challenges for reconciling the two main formulations of the classical double copy: the Kerr-Schild double copy and the Weyl double cop…
Generalized Vaidya Spacetime in Cotton and Conformal Killing Theories
Metin Gürses, Yaghoub Heydarzade, Çetin Şentürk
We demonstrate that the non-vacuum field equations of Cotton gravity and Conformal Killing gravity admit a generalized class of Vaidya-type solutions. In particular, beyond the sta…
Algebra structure of conformal Killing-Yano forms in geometries with skew-symmetric torsion
Ümit Ertem, Özgür Kelekçi, Özgür Açık
We consider conformal Killing-Yano forms corresponding to the antisymmetric generalizations of conformal Killing vectors to higher degree forms in the presence of skew-symmetric to…
Some results on generalized Hukuhara diamond-α derivative and integral of fuzzy valued functions and on time scales
Selami Bayeğ, Funda Raziye Mert, Billur Kaymakçalan
In this paper, we define generalized Hukuhara diamond-alpha integral for fuzzy functions on time scales and obtain some of its fundamental properties and also we establish the rela…
Wave Metrics in the Cotton and Conformal Killing Gravity Theories
Metin Gürses, Yaghoub Heydarzade, Çetin Şentürk
We study wave metrics in the context of Cotton Gravity and Conformal Killing Gravity. First, we consider pp-wave metrics with flat and non-flat wave surfaces and show that they are…
Classical double copy in the black hole mini-superspace
Gokhan Alkac, Mehmet Kemal Gumus, Mehmet Ali Olpak
We give a novel formulation of classical double copy in the mini-superspace of static, spherically symmetric black holes where the map between the solutions of general relativity a…
Minimal Einstein-Aether Theory
Metin Gurses, Cetin Senturk, Bayram Tekin
We show that there is a phenomenologically and theoretically consistent limit of the generic Einstein-Aether theory in which the Einstein-Aether field equations reduce to Einstein…
Regularized Weyl double copy
Gokhan Alkac, Mehmet Kemal Gumus, Oguzhan Kasikci +2
We propose a regularization procedure in the sourced Weyl double copy, a spinorial version of the classical double copy, such that it matches much more general results in the Kerr-…
Classification of Killing Magnetic Curves In H^3
Özgür Kelekçi, Furkan Semih Dündar, Gülhan Ayar
In this paper, we study classification of magnetic curves corresponding to Killing vector fields of H^3 (hyperbolic 3-space). First, we solve the geodesic equation analytically. Th…
Israel-Wilson-Perjes Metrics in a Theory with a Dilaton Field
Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin
We are interested in the charged dust solutions of the Einstein field equations in stationary and axially symmetric spacetimes; and inquire if the naked singularities of the Israel…
Flying robots for a smarter life
Abdullatif Baba
Innovative ideas are continuously emerging to produce better life conditions where essential human needs are supposed to be fulfilled with perfect scenarios leading us to propose m…
On Kähler Structures of Taub-NUT and Kerr Spaces
Özgür Kelekçi
In this paper, we study the Kählerian nature of Taub-NUT and Kerr spaces which are gravitational instanton and black hole solutions in general relativity. We show that Euclidean Ta…
Generalized Black Holes in 3D Kerr-Schild Double Copy
Gokhan Alkac, Mehmet Kemal Gumus, Mehmet Ali Olpak
The double copy of the Coulomb solution in three dimensions is a non-vacuum solution that can be obtained through different matter couplings. It is the static black hole solution o…
Kerr-Schild-Kundt Metrics in Generic Einstein-Maxwell Theories
Metin Gurses, Yaghoub Heydarzade, Cetin Senturk
We study Kerr-Schild-Kundt class of metrics in generic gravity theories with Maxwell's field. We prove that these metrics linearize and simplify the field equations of generic grav…
New Chiral Generalized Minimal Massive Gravity
Mohammad Reza Setare, Seyed Naseh Sajadi, Suat Dengiz +1
We study the generalized minimal massive gravity (GMMG) in Compere, Song and Strominger boundary conditions employing a semi-product of a Virasoro and a Kac-Moody curr…
Kerr-Schild-Kundt Metrics in Generic Gravity Theories with Modified Horndeski Couplings
Metin Gurses, Yaghoub Heydarzade, Cetin Senturk
The Kerr-Schild-Kundt (KSK) metrics are known to be one of the universal metrics in general relativity, which means that they solve the vacuum field equations of any gravity theory…
Exact gyratons in higher and infinite derivative gravity
Ivan Kolář, Tomáš Málek, Suat Dengiz +1
We study solutions describing spinning null sources called gyratons in generic theories of gravity with terms that are quadratic in curvature and contain an arbitrary number of cov…
Kerr-Schild Double Copy of the Coulomb Solution in Three Dimensions
Gokhan Alkac, Mehmet Kemal Gumus, Mehmet Ali Olpak
While the Kerr-Schild double copy of the Coulomb solution in dimensions higher than three is the Schwarzschild black hole, it is known that it should be a non-vacuum solution in th…
Operator representation and logistic extension of elementary cellular automata
M. Ibrahimi, A. Güçlü, N. Jahangirov +3
We redefine the transition function of elementary cellular automata (ECA) in terms of discrete operators. The operator representation provides a clear hint about the way systems be…
Comment on "Einstein-Gauss-Bonnet Gravity in 4-Dimensional Space-Time''
Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin
We summarize our proof that the "Einstein-Gauss-Bonnet Gravity in Four-Dimensional Spacetime" introduced in Phys. Rev. Lett. 124, 081301 (2020) does not have consistent field equat…
Impulsive waves in ghost free infinite derivative gravity in anti-de Sitter spacetime
Suat Dengiz, Ercan Kilicarslan, Ivan Kolář +1
We study exact impulsive gravitational waves propagating in anti-de Sitter spacetime in the context of the ghost free infinite derivative gravity. We show that the source-free theo…
Is there a novel Einstein-Gauss-Bonnet theory in four dimensions?
Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin
No! We show that the field equations of Einstein-Gauss-Bonnet theory defined in generic dimensions split into two parts one of which always remains higher dimensional, and he…
A new design of a flying robot, with advanced computer vision techniques to perform self-maintenance of smart grids
Abdullatif Baba
In this paper, we present a full design of a flying robot to investigate the state of power grid components and to perform the appropriate maintenance procedures according to each…