What is Newman Penrose Formalism?

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What is Newman Penrose Formalism?

Are there any easy-to-read references? I find their original work on N-P Formalism, but only find it is a bit difficult for me...

Thank you.
 
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The N-P Formalism is a formulation of Einstein's equations based on a null tetrad, mainly useful for discussing radiation problems. What makes it seem so complicated is that instead of index notation, they assign a different Greek letter to each one of the Ricci rotation coeficients.
 
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Thank you. But I do not find anything about NP Formalism in Ryder's Book...
 
yicong2011 said:
Thank you. But I do not find anything about NP Formalism in Ryder's Book...

Look in section 7.8 Rotating Black Holes: Kerr Solution.
 

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