A particularly important area for such software infrastructure is mesh
refinement5.
This is essential to much current numerical-relativity research but is moderately difficult to implement even
in only one spatial dimension, and much harder in multiple spatial dimensions. There are now a number of
software libraries providing multi-dimensional mesh-refinement infrastructure (sometimes combined with
parallelization), such as those listed in Table 1. The Cactus toolkit can be used in either unigrid or
mesh-refinement modes, the latter using a “mesh-refinement driver” such as PAGH or Carpet [134
, 131
]
(
http://www.carpetcode.org).
In this review I point out event and apparent horizon finders which have been written in particular frameworks and comment on whether they work with mesh refinement.
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