A '3+1' method for finding principal null directions

Laurens Gunnarsen*, Hisa Aki Shinkai, Kei Ichi Maeda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We present a new method for finding principal null directions (PNDs). Because our method assumes as an input the intrinsic metric and extrinsic curvature of a space-like hypersurface, we expect it will be useful to numerical relativists. We illustrate our method by finding the PNDs of the Kastor - Traschen spacetimes, which contain arbitrarily many Q=M black holes in a de Sitter background.

Original languageEnglish
Article number011
Pages (from-to)133-140
Number of pages8
JournalClassical and Quantum Gravity
Issue number1
Publication statusPublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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