18 citations · 146 across the 25 of their papers we have counts for
25 papers
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…
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…
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…
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…
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…
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…
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…
Hawking Temperature as the Total Gauss-Bonnet Invariant of the Region Outside a Black Hole
Emel Altas, Bayram Tekin
We provide two novel ways to compute the surface gravity () and the Hawking temperature of a stationary black hole: in the first method is given as the three-v…
Anomalous Dispersion in Gravity Theories
Emel Altas, Ercan Kilicarslan, Bayram Tekin
A wave pulse (be it a gravitational wave or a light wave) undergoes anomalous dispersion in a vacuum in flat spacetimes with an even number of spatial dimensions even if all the fr…
Perturbative solution of the Einstein Constraints with Spin and Momentum Far Away From a Binary Source in the Bowen-York formalism
Emel Altas, Emine Ertugrul, Bayram Tekin
We study the momentum and Hamiltonian constraints of vacuum Einstein equations, within the Bowen-York formalism, for two interacting black holes in close separation, with anti-para…
Basics of Apparent Horizons in Black Hole Physics
Emel Altas, Bayram Tekin
Event Horizon, a null hypersurface defining the boundary of the black hole region of a spacetime, is not particularly useful for evolving black holes since it is non-local in time.…
Einstein-Yang-Mills Theory: Gauge Invariant Charges and Linearization Instability
Emel Altas, Ercan Kilicarslan, Bayram Tekin
We construct the gauge-invariant electric and magnetic charges in Yang-Mills theory coupled to cosmological General Relativity (or any other geometric gravity), extending the flat…
Approximate analytical description of apparent horizons for initial data with momentum and spin
Emel Altas, Bayram Tekin
We construct analytical initial data for a slowly moving and rotating black hole for generic orientations of the linear momentum and the spin. We solve the Hamiltonian constraint a…
Bowen-York Model Solution Redux
Emel Altas, Bayram Tekin
Initial value problem in General Relativity is often solved numerically; with only a few exceptions one of which is the "model" solution of Bowen and York where an analytical form…
Energy and Angular Momentum in D dimensional Kerr-AdS black holes-new formulation
Emel Altas
Recently it was shown that the conserved charges of asymptotically anti de Sitter spacetimes can be written in an explicitly gauge-invariant way in terms of the linearized Riemann…
Non-stationary Energy in General Relativity
Emel Altas, Bayram Tekin
Using the time evolution equations of (cosmological) General Relativity in the first order Fischer-Marsden form, we construct an integral that measures the amount of non-stationary…
Second Order Gauge Invariant Perturbation Theory and Conserved Charges in Cosmological Einstein's Gravity
Emel Altas
Recently a new approach in constructing the conserved charges in cosmological Einstein's gravity was given. In this new formulation, instead of using the explicit form of the field…
Second Order Perturbation Theory in General Relativity: Taub Charges as Integral Constraints
Emel Altas, Bayram Tekin
In a nonlinear theory, such as General Relativity, linearized field equations around an exact solution are necessary but not sufficient conditions for linearized solutions. Therefo…
New approach to conserved charges of generic gravity in AdS
Emel Altas, Bayram Tekin
Starting from a divergence-free rank-4 tensor of which the trace is the cosmological Einstein tensor, we give a construction of conserved charges in Einstein's gravity and its high…
Conserved charges in AdS: A new formula
Emel Altas, Bayram Tekin
We give a new construction of conserved charges in asymptotically anti-de Sitter spacetimes in Einstein's gravity. The new formula is explicitly gauge-invariant and makes direct us…
Linearization Instability in Gravity Theories
Emel Altas
In a nonlinear theory, such as gravity, physically relevant solutions are usually hard to find. Therefore, starting from a background exact solution with symmetries, one uses the p…
Linearization Instability of Chiral Gravity
Emel Altas, Bayram Tekin
Carrying out an analysis of the constraints and their linearizations on a spacelike hypersurface, we show that topologically massive gravity has a linearization instability at the…
Linearization Instability for Generic Gravity in AdS
Emel Altas, Bayram Tekin
In general relativity, perturbation theory about a background solution fails if the background spacetime has a Killing symmetry and a compact spacelike Cauchy surface. This failure…
Holographically Viable Extensions of Topologically Massive and Minimal Massive Gravity?
Emel Altas, Bayram Tekin
Recently, an extension of the topologically massive gravity (TMG) in dimensions, dubbed as minimal massive gravity (MMG), was found which is free of the bulk-boundary unitari…