Slicing conditions for axisymmetric gravitational collapse of Brill waves. (English) Zbl 1431.83007
Summary: 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 ‘quasi-maximal’ 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 compactified spacetime diagrams. These invariants are also used to show how created black holes settle down to a Schwarzschild black hole. For Brill waves see [D. Brill, “On the positive definite mass of the Bondi-Weber-Wheeler time-symmetric gravitational waves”, Ann. Phys. 7, No. 4, 466–483 (1959; doi:10.1016/0003-4916(59)90055-7); in: Gravitation. Problems. Prospects. Kiev: “Naukova Dumka”. 17–22 (1972; Zbl 0264.53031)].
MSC:
| 83C05 | Einstein’s equations (general structure, canonical formalism, Cauchy problems) |
| 83C75 | Space-time singularities, cosmic censorship, etc. |
| 83C15 | Exact solutions to problems in general relativity and gravitational theory |
| 83C35 | Gravitational waves |
| 83-08 | Computational methods for problems pertaining to relativity and gravitational theory |
Citations:
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