459 citations · 3.9k across the 157 of their papers we have counts for
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Nonlinear Degrees of Freedom of Born-Infeld New Massive Gravity
Zeynep Su Koc, Bayram Tekin
Born-Infeld New Massive Gravity (BINMG) is an all-order curvature extension of New Massive Gravity in three dimensions, whose linearized spectrum around its unique maximally symmet…
Conserved Gravitational Charges as Curvature Fluxes
Emel Altas, Bayram Tekin
Conserved gravitational charges are commonly expressed as surface integrals of the metric perturbation and its first derivatives. We show that, in the usual asymptotically AdS and…
Dynamical Completion of Coupling-Charge Thermodynamics
Kamal Hajian, Bayram Tekin
The scalar-gauge pair formulation promotes gravitational coupling constants to conserved charges, clarifying their role in extended black hole thermodynamics. However, its original…
The auxiliary-metric formulation of Born-Infeld New Massive Gravity
Bayram Tekin
Born-Infeld New Massive Gravity (BINMG) completes New Massive Gravity to all orders in curvature through the determinant of the metric shifted by the Einstein tensor. We recast it…
The Flat Critical Branch Between Nariai and Bertotti-Robinson Geometries as a Solution of Cosmological Einstein-Maxwell Theory
Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin
We analyze a class of product geometries of the form supported by electric, magnetic, or dyonic flux in the Einstein-Maxwell- theory. These spacetim…
Static Tidal Perturbations of Relativistic Stars: Corrected Center Expansion and Love Numbers-I
Emel Altas, Ercan Kilicarslan, Onur Oktay +1
We revisit static tidal perturbations of relativistic stars with emphasis on two technical issues in the standard quadrupolar formulation. First, we derive the regular-center Frobe…
Geometrically Significant Surfaces of Black Holes from a Single Scalar
Cagdas Ulus Agca, Bayram Tekin
Black hole spacetimes contain several geometrically distinguished hypersurfaces, including event and Cauchy horizons, stationary-limit surfaces, and curvature singularities. These…
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…
Geometry is Wavy: Curvature Wave Equations for Generic Affine Connections
Emel Altas, Bayram Tekin
Geometry is wavy: even at the purely geometric level (no particular theory chosen), curvature satisfies a covariant quasilinear wave equation. In Riemannian geometry equipped with…
A Universal Smarr Formula via Coupling Constants
Kamal Hajian, Bayram Tekin, Onur Ucanok
In gravitational theories containing matter fields and higher-derivative corrections, the standard Smarr formula often fails unless all dimensionful couplings are incorporated cons…
Can Fractional Time Operators Reproduce Gravitational-Wave Memory? A No-Go Result
Sercan Kaya, Bayram Tekin
We initiate an investigation into whether fractional calculus, with its intrinsic long-tailed memory and nonlocal features, can provide a viable model for gravitational-wave memory…
Perturbative Analytical Construction of Bowen-York Initial Data for Binary Black Holes up to Third Order in Spin and Linear Momentum
Leyla Ogurol, Tore Boybeyi, Bayram Tekin
We analytically construct initial data for binary black hole systems by solving the Einstein constraint equations within the Bowen-York framework. Allowing for arbitrarily oriented…
Instability and Information Production Around Kerr Black Holes: Effects on Entropy and the Shadow
Aydin Tavlayan, Bayram Tekin
Massless or massive particles in unstable orbits around a Kerr black hole exhibit exponentially unstable motion when perturbed. They either plunge into the black hole or escape to…
Physical Interpretations of Integration Constants and Large Gauge Effects in Flat and AdS Spacetimes
Leyla Ogurol, Bayram Tekin
As in other partial differential equations, one ends up with some arbitrary constants or arbitrary functions when one integrates Einstein's equations, or more generally field equat…
Consistency Problems of Conformal Killing Gravity
Emel Altas, Bayram Tekin
We show that gravity field equations based on a tensor with rank greater than 2 have consistency problems in the sense that integration constants in the solutions, such as the para…
Fluid-membrane Descriptions of Various Black Holes
Cagdas Ulus Agca, Bayram Tekin
The membrane paradigm of black holes is an effective theory that replaces the event horizon with a fictitious yet tangible fluid. It has provided us with valuable insights, especia…
Vanishing of Conserved Charges in Cotton Gravity
Emel Altas, Bayram Tekin
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…
Refined Thermodynamics of Black Holes with Proper Conserved Charges
Aydin Tavlayan, Bayram Tekin
Field equations of a classical, geometric, theory of gravity, augmented with some semiclassical considerations strongly suggest that the gravitational field representing a stationa…
Membrane Paradigm Approach to the Johannsen-Psaltis Black Hole
Cagdas Ulus Agca, Bayram Tekin
The Johannsen-Psaltis (JP) black hole is a phenomenologically viable metric obtained by judiciously deforming the Kerr black hole such that the metric is asymptotically flat and ca…
Constraints and Time Evolution in Generic (Riemann) Gravity
Emel Altas, Bayram Tekin
We give a detailed canonical analysis of the -dimensional (Riemann) gravity, correcting the earlier results in the literature. We also write the field equations in the Fische…
Spin-spin Interactions in General Relativity versus Linearized Massive Gravity: -body Simulations
Eren Gulmez, Bayram Tekin
We simulated spin-spin interactions of -bodies in linearized General Relativity (GR) and linearized Massive Gravity of the Fierz-Pauli type (mGR). It was noted earlier that ther…
Anomaly Induced Inflation in the Minimal Quartic Extension of Einstein's Gravity
Kerim Demirel, Bayram Tekin
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 v…
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…
Non-stationary Energy of Perfect Fluid Sources in General Relativity
Emel Altas, Bayram Tekin
The ADM energy for asymptotically flat spacetimes or its generalizations to asymptotically non-flat spacetimes measure the energy content of a stationary spacetime, such as a singl…