Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Altas, Emel"'
Autor:
Altas, Emel, Tekin, Bayram
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 the black holes, have vanishin
Externí odkaz:
http://arxiv.org/abs/2411.02132
Autor:
Altas, Emel, Tekin, Bayram
Publikováno v:
J.Phys.A 57 (2024) 38, 385204
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 identifying the non-stationary ene
Externí odkaz:
http://arxiv.org/abs/2405.12037
Autor:
Altas, Emel, Tekin, Bayram
Publikováno v:
Phys.Rev.D 109 (2024) 4, 044001
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 single black hole. Such a stationary energy is given as a geometric invaria
Externí odkaz:
http://arxiv.org/abs/2312.02822
Autor:
Altas, Emel, Tekin, Bayram
We provide two novel ways to compute the surface gravity ($\kappa$) and the Hawking temperature $(T_{H})$ of a stationary black hole: in the first method $T_{H}$ is given as the three-volume integral of the Gauss-Bonnet invariant (or the Kretschmann
Externí odkaz:
http://arxiv.org/abs/2208.12993
Publikováno v:
Phys.Rev.D 105 (2022) 6, 064027
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 frequencies move at the same speed. Such an anomalous dispersion does no
Externí odkaz:
http://arxiv.org/abs/2112.14020
Publikováno v:
Fortschr. Phys. 2023, 2300080
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-parallel spins and anti-parallel linear momenta. We give an analytical sol
Externí odkaz:
http://arxiv.org/abs/2112.13360
Autor:
Altas, Emel, Tekin, Bayram
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. Instead, one uses the more tangible concept of Apparent Horizon for d
Externí odkaz:
http://arxiv.org/abs/2108.05119
Publikováno v:
Eur.Phys.J.C 81 (2021) 7, 648
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 spacetime construction of Abbott and Deser. For non-vanishing backgrou
Externí odkaz:
http://arxiv.org/abs/2105.11744
Autor:
Altas, Emel, Tekin, Bayram
Publikováno v:
Phys. Rev. D 103, 084036 (2021)
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 approximately and work out the properties of the apparent horizon and s
Externí odkaz:
http://arxiv.org/abs/2012.04450
Autor:
Altas, Emel, Tekin, Bayram
Publikováno v:
Eur. Phys. J. C 81, 328 (2021)
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 of the solution is available. The solution describes a dynamical, time
Externí odkaz:
http://arxiv.org/abs/2007.14279