Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Improved Gauge Driver for the Generalized Harmonic Einstein System   A new gauge driver is introduced for the generalized harmonic (GH)
representation of Einstein's equation. This new driver allows a rather general
class of gauge conditions to be implemented in a way that maintains the
hyperbolicity of the combined evolution system. This driver is more stable and
effective, and unlike previous drivers, allows stable evolutions using the
dual-frame evolution technique. Appropriate boundary conditions for this new
gauge driver are constructed, and a new boundary condition for the ``gauge''
components of the spacetime metric in the GH Einstein system is introduced. The
stability and effectiveness of this new gauge driver are demonstrated through
numerical tests, which impose a new damped-wave gauge condition on the
evolutions of single black-hole spacetimes.

28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
19
The categories of this paper are: eess