Living Reviews in Relativity

"Null Geodesic Congruences, Asymptotically-Flat Spacetimes and Their Physical Interpretation"
by
Timothy M. Adamo and Ezra T. Newman and Carlos Kozameh 

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Abstract
1 Introduction
2 Foundations
3 Shear-Free NGCs in Minkowski Space
4 The Good-Cut Equation and ℋ-Space
5 Simple Applications
6 Main Results
7 Gauge (BMS) Invariance
8 Discussion/Conclusion
9 Acknowledgments
A Twistor Theory
B CR Structures
C Tensorial Spin-s Spherical Harmonics
D ℋ-Space Metric
E Shear-Free Congruences from Complex World Lines
F The Generalized Good-Cut Equation
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