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Weyl scalar : ウィキペディア英語版
Weyl scalar
In the Newman–Penrose (NP) formalism of general relativity, Weyl scalars refer to a set of five complex scalars \ which encode the ten independent components of the Weyl tensors of a four-dimensional spacetime.
==Definitions==
Given a complex null tetrad \ and with the convention \, the Weyl-NP scalars are defined by〔Jeremy Bransom Griffiths, Jiri Podolsky. ''Exact Space-Times in Einstein's General Relativity''. Cambridge: Cambridge University Press, 2009. Chapter 2.〕〔Valeri P Frolov, Igor D Novikov. ''Black Hole Physics: Basic Concepts and New Developments''. Berlin: Springer, 1998. Appendix E.〕〔Abhay Ashtekar, Stephen Fairhurst, Badri Krishnan. ''Isolated horizons: Hamiltonian evolution and the first law''. Physical Review D, 2000, 62(10): 104025. Appendix B. (gr-qc/0005083 )〕
:\Psi_0 := C_ l^\alpha m^\beta l^\gamma m^\delta\ ,
:\Psi_1 := C_ l^\alpha n^\beta l^\gamma m^\delta\ ,
:\Psi_2 := C_ l^\alpha m^\beta \bar^\gamma n^\delta\ ,
:\Psi_3 := C_ l^\alpha n^\beta \bar^\gamma n^\delta\ ,
:\Psi_4 := C_ n^\alpha \bar^\beta n^\gamma \bar^\delta\ .
Note: If one adopts the convention \, the definitions of \Psi_i should take the opposite values;〔Ezra T Newman, Roger Penrose. ''An Approach to Gravitational Radiation by a Method of Spin Coefficients''. Journal of Mathematical Physics, 1962, 3(3): 566-768.〕〔Ezra T Newman, Roger Penrose. ''Errata: An Approach to Gravitational Radiation by a Method of Spin Coefficients''. Journal of Mathematical Physics, 1963, 4(7): 998.〕〔Subrahmanyan Chandrasekhar. ''The Mathematical Theory of Black Holes''. Chicago: University of Chikago Press, 1983.〕〔Peter O'Donnell. ''Introduction to 2-Spinors in General Relativity''. Singapore: World Scientific, 2003.〕 that is to say, \Psi_i\mapsto-\Psi_i after the signature transition.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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