Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-05-04
Int.J.Mod.Phys. D15 (2006) 107-119
Physics
High Energy Physics
High Energy Physics - Theory
12 pages, 7 figures; major conceptual changes, other tests added; accepted for publication by Int.J.Mod.Phys.D
Scientific paper
10.1142/S0218271806007614
Numerical evolution of the spherically symmetric, massive Klein-Gordon field is presented using a new adaptive mesh refinement (AMR) code with fourth order discretization in space and time, along with compactification in space. The system is non-interacting thus the initial disturbance is entirely radiated away. The main aim is to simulate its propagation until it vanishes near scri^+. By numerical investigations of the violation of the energy balance relations, the space-time boundaries of ``well-behaving'' regions are determined for different values of the AMR parameters. An important result is that mesh refinement maintains precision in the central region for longer time even if the mesh is only refined outside of this region. The speed of the algorithm was also tested, in case of 10 refinement levels the algorithm was two orders of magnitude faster than the extrapolated time of the corresponding unigrid run.
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