Zobrazeno 1 - 10
of 128
pro vyhledávání: '"Ansorg, Marcus"'
We present the first fully relativistic numerical calculations of differentially rotating Strange Quark Stars models for broad ranges of the maximum density and of the degree of differential rotation. Our simulations are performed with the very accur
Externí odkaz:
http://arxiv.org/abs/1904.03759
Publikováno v:
Phys. Rev. D 98, 124005 (2018)
We study quasi-normal modes of black holes, with a focus on resonant (or quasi-normal mode) expansions, in a geometric frame based on the use of conformal compactifications together with hyperboloidal foliations of spacetime. Specifically, this work
Externí odkaz:
http://arxiv.org/abs/1809.02837
We study the main astrophysical properties of differentially rotating neutron stars described as stationary and axisymmetric configurations of a moderately stiff $\Gamma=2$ polytropic fluid. The high level of accuracy and of stability of our relativi
Externí odkaz:
http://arxiv.org/abs/1609.02336
Autor:
Kalisch, Michael, Ansorg, Marcus
Publikováno v:
Michael Kalisch and Marcus Ansorg 2016 Class. Quantum Grav. 33 215005
In this paper, we describe in detail a scheme for the construction of highly accurate numerical solutions to Einstein's field equations in five and six spacetime dimensions corresponding to non-uniform black strings. The scheme consists of a sophisti
Externí odkaz:
http://arxiv.org/abs/1607.03099
Publikováno v:
Phys. Rev. D 93, 124016 (2016)
In this paper we present a spectral decomposition of solutions to relativistic wave equations described on horizon penetrating hyperboloidal slices within a given Schwarzschild-black-hole background. The wave equa- tion in question is Laplace-transfo
Externí odkaz:
http://arxiv.org/abs/1604.02261
Autor:
Kalisch, Michael, Ansorg, Marcus
We construct numerically static non-uniform black string solutions in six dimensions by using pseudo-spectral methods. An appropriately designed adaptation of the methods in regard of the specific behaviour of the field quantities in the vicinity of
Externí odkaz:
http://arxiv.org/abs/1509.03083
We confirm the convergence of the derivative expansion in two supersymmetric models via the functional renormalization group method. Using pseudo-spectral methods, high-accuracy results for the lowest energies in supersymmetric quantum mechanics and
Externí odkaz:
http://arxiv.org/abs/1409.5650
Autor:
Macedo, Rodrigo P., Ansorg, Marcus
Publikováno v:
Journal of Computational Physics 276, 357-379 (2014)
We present a fully pseudo-spectral scheme to solve axisymmetric hyperbolic equations of second order. With the Chebyshev polynomials as basis functions, the numerical grid is based on the Lobbato (for two spatial directions) and Radau (for the time d
Externí odkaz:
http://arxiv.org/abs/1402.7343
Publikováno v:
David Schinkel et al 2014 Class. Quantum Grav. 31 075017
Recently, there have been efforts to solve Einstein's equation in the context of a conformal compactification of space-time. Of particular importance in this regard are the so called CMC-foliations, characterized by spatial hyperboloidal hypersurface
Externí odkaz:
http://arxiv.org/abs/1310.4699
Publikováno v:
Class. Quantum Grav. 31 165001 (2014)
We construct initial data corresponding to a single perturbed Kerr black hole in vacuum. These data are defined on specific hyperboloidal ("ACMC-") slices on which the mean extrinsic curvature K asymptotically approaches a constant at future null inf
Externí odkaz:
http://arxiv.org/abs/1301.6984