Cohomology and massless fields

@article{Eastwood1981CohomologyAM,
  title={Cohomology and massless fields},
  author={Michael Eastwood and Roger Penrose and Raymond O. Wells},
  journal={Communications in Mathematical Physics},
  year={1981},
  volume={78},
  pages={305-351}
}
The geometry of twistors was first introduced in Penrose [28]. Since that time it has played a significant role in solutions of various problems in mathemetical physics of both a linear and nonlinear nature (cf. Penrose [29], Penrose [35], Ward [48], and Atiyah-Hitchin-Drinfeld-Manin [2], see Wells [52] for a recent survey of the topic with a more extensive bibliography). The major role it has played has been in setting up a general correspondence which translates certain important physical… 
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References

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AbstractThe formalism of twistors [the ‘spinors’ for the group O(2,4)] is employed to give a concise expression for the solution of the zero rest-mass field equations, for each spin (s=0, 1/2, 1,
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A zero rest-mass field of arbitrary spin s determines, at each event in space-time, a set of 2s principal null directions which are related to the radiative behaviour of the field. These directions
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