Publikace ÚTF

Slicing conditions for axisymmetric gravitational collapse of Brill waves

Khirnov., A.; Ledvinka, T.

In numerical relativity, spacetimes involving compact strongly gravitating objects are constructed as numerical solutions of Einstein’s equations. Success of such a process strongly depends on the availability of appropriate coordinates, which are typically constructed dynamically. A very robust coordinate choice is a so-called moving puncture gauge, commonly used for numerical simulations of black hole spacetimes. Nevertheless it is known
to fail for evolving near-critical Brill wave data. We construct a new ‘quasimaximal’ slicing condition and demonstrate that it exhibits better behavior for such data. This condition is based on the 1+log slicing with an additional source term derived from maximal slicing. It is relatively simple to implement in existing moving puncture codes and computationally inexpensive. We also illustrate the properties of constructed spacetimes based on gauge-independent quantities in compactifed spacetime diagrams. These invariants are also used to show how created black holes settle down to a Schwarzschild black hole.
type:article
journal:Class. Quantum Grav.
volume:35
pages:215003
year:2018
eprint:arXiv:1908.06034
grants:Albert Einstein Center for Gravitation and Astrophysics, GAČR 14-37086G; 2014-2018; hlavní řešitel: Jiří Bičák Centrum Alberta Einsteina pro gravitaci a astrofyziku
Numerické simulace v obecné relativitě a astrofyzice; 2014-2016; řešitelé: Anton Khirnov, Lukáš Ledvina, Vojtěch Witzany
Aktuální problémy teoretické fyziky, astronomie a astrofyziky; 2015; řešitel: Oldřich Semerák
files:
khirnov_2018_class._quantum_grav._35_215003.pdf (7596.24 kB)

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