Gauge pathologies in singularity-avoidant spacetime foliations - INSPIRE

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Gauge pathologies in singularity-avoidant spacetime foliations

C. Bona
(
- Balearic Islands U.
)
,
T. Ledvinka
(
- Charles U.
)
,
C. Palenzuela-Luque
(
- Louisiana State U.
)
,
J.A. Pons
(
- Alicante U.
)
,
M. Zacek
(
- Charles U.
)

Oct, 2004

8 pages

e-Print:

gr-qc/0410079 [gr-qc]

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Abstract: (arXiv)

The family of generalized-harmonic gauge conditions, which is currently used in Numerical Relativity for its singularity-avoidant behavior, is analyzed by looking for pathologies of the corresponding spacetime foliation. The appearance of genuine shocks, arising from the crossing of characteristic lines, is completely discarded. Runaway solutions, meaning that the lapse function can grow without bound at an accelerated rate, are instead predicted. Black Hole simulations are presented, showing spurious oscillations due to the well known slice stretching phenomenon. These oscillations are made to disappear by switching the numerical algorithm to a high-resolution shock-capturing one, of the kind currently used in Computational Fluid Dynamics. Even with these shock-capturing algorithms, runaway solutions are seen to appear and the resulting lapse blow-up is causing the simulations to crash. As a side result, a new method is proposed for obtaining regular initial data for Black Hole spacetimes, even inside the horizons.

References(17)

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