Gioel Calabrese 2004 Class. Quantum Grav. 21 4025 doi:10.1088/0264-9381/21/17/002
Gioel Calabrese
Show affiliationsRapid growth of constraints is often observed in free evolutions of highly gravitating systems. To alleviate this problem, we investigate the effect of adding spatial derivatives of the constraints to the right-hand side of the evolution equations, and we look at how this affects the character of the system and the treatment of boundaries. We apply this technique to two formulations of Maxwell's equations, the so-called fat Maxwell and the Knapp–Walker–Baumgarte systems, and obtain mixed hyperbolic–parabolic problems in which high frequency constraint violations are damped. Constraint-preserving boundary conditions amount to imposing Dirichlet boundary conditions on constraint variables, which translate into Neumann-like boundary conditions for the main variables. The success of the numerical tests presented in this work suggests that this remedy may bring benefits to fully nonlinear simulations of general relativity.
Issue 17 (7 September 2004)
Received 7 April 2004
Published 10 August 2004
Gioel Calabrese 2004 Class. Quantum Grav. 21 4025
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