Principal null directions of perturbed black holes

Z. Perjés, M. Vasúth

Research output: Contribution to journalArticle

2 Citations (Scopus)


The properties of principal null directions of a perturbed black hole are investigated. It is shown that principal null directions are directly observable quantities characterizing the spacetime. A definition of a perturbed spacetime, generalizing that given by Stewart and Walker, is proposed. This more general framework allows one to include descriptions of a given spacetime other than by a pair (M, g) where M is a four-dimensional differential manifold and g a Lorentz metric. Examples of alternative characterizations are the curvature representation of Karlhede and others, the Newman-Penrose representation or observable quantities involving principal null directions. The conditions are studied under which the various alternative choices of observables provide equivalent descriptions of the spacetime.

Original languageEnglish
Pages (from-to)5241-5252
Number of pages12
JournalClassical and Quantum Gravity
Issue number24
Publication statusPublished - Dec 21 2003

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Principal null directions of perturbed black holes'. Together they form a unique fingerprint.

  • Cite this