Bayram Tekin

E-mail

btekin@metu.edu.tr

Department

Department of Physics

ORCID

0000-0002-0792-9010

Scopus Author ID

6701407460

Web of Science Researcher ID

P-9269-2019

Vanishing of conserved charges in Cotton gravity Altas, Emel; Tekin, Bayram (2025-02-01) Cotton gravity was recently introduced as a higher derivative extension of general relativity. The field equations of the theory involve the rank-3 Cotton tensor. Here we show that all solutions of the theory, including th...
Anomaly induced inflation in the minimal quartic extension of Einstein’s gravity Demirel, Kerim; Tekin, Bayram (2024-12-01) A particular extension of Einstein’s General Relativity up to and including quartic terms in the curvature tensor is minimal in the sense that it has a unique maximally symmetric vacuum and only a massless spin-2 excitatio...
A search for Planet Nine with small spacecraft: Three-body, post-Newtonian, non-gravitational, planetary and Kuiper Belt effects Koprucu, Sahin Ulas; Tekin, Bayram (2024-12-01) A hypothetical gravitating body in the outer Solar System, the so-called Planet Nine, was proposed to explain the unexpected clustering of the Kuiper Belt Objects. As it has not been observed via telescopes, it was conject...
Constraints and time evolution in generic f(Riemann) gravity Altas, Emel; Tekin, Bayram (2024-10-11) We give a detailed canonical analysis of the n-dimensional f(Riemann) gravity, correcting the earlier results in the literature. We also write the field equations in the Fischer-Marsden form which is amenable to identifyin...
Minimal Einstein-Aether theory Gürses, Metin; Şentürk, Çetin; Tekin, Bayram (2024-09-01) 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 field equations with a perfect fluid distr...
Spin-spin interactions in general relativity versus linearized massive gravity: N -body simulations Gulmez, Eren; Tekin, Bayram (2024-08-15) We simulated spin-spin interactions of N-bodies in linearized general relativity (GR) and linearized massive gravity of the Fierz-Pauli type (mGR). It was noted earlier that there is a discrete difference between the spin-...
Membrane paradigm approach to the Johannsen-Psaltis black hole Ağca, Çağdaş Ulus; Tekin, Bayram (2024-05-15) The Johannsen-Psaltis black hole is a phenomenologically viable metric obtained by judiciously deforming the Kerr black hole such that the metric is asymptotically flat and causal and is consistent with the weak field, pos...
Coupling Constants as Conserved Charges in Black Hole Thermodynamics Hajian, Kamal; Tekin, Bayram (2024-05-10) In a generic theory of gravity coupled to matter fields, the Smarr formula for black holes does not work properly if the contributions of the coupling constants defining the theory are not incorporated. However, these coup...
Mass formulas for individual black holes in merging binaries Ozkarsligil, Zeynep Tugce; Tekin, Bayram (2024-03-01) We give formulas for individual black hole masses in a merger, by using Newtonian physics, in terms of the three measured quantities in the detector: the initial wave frequency f 1, the maximum detected frequency (chirp fr...
Nonstationary energy of perfect fluid sources in general relativity Altas, Emel; Tekin, Bayram (2024-02-15) The Arnowitt-Deser-Misner (ADM) energy for asymptotically flat spacetimes or its generalizations to asymptotically nonflat spacetimes measure the energy content of a stationary spacetime, such as a single black hole. Such ...

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