Phys. Rev. Lett. 61, 2042–2045 (1988)Null-Strut Calculus: The First TestReceived 13 June 1988; published in the issue dated 31 October 1988 We solve Einstein's field equation via null-strut calculus (NSC). This working version of Regge calculus makes maximal use of light rays. We model the Kasner universe—prototype of the Belinsky-Khalatnikov-Lifshitz mixmaster oscillation generic to all crunch cosmologies. We demonstrate that in evolution NSC (1) conserves energy to a degree comparable to the standard finite difference method, and (2) is free of the Courant instability. NSC handles successfully both the dynamics and the manufacture of the initial-value data, in full conformity with the York initial-value prescription. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.61.2042
DOI:
10.1103/PhysRevLett.61.2042
PACS:
04.20.Jb, 04.20.Cv, 04.20.Me
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