Abstract
The quantum theory of massless fields in an asymptotically simple space-time is developed. The Schwinger dynamical principle and the Penrose conformal technique are exploited to derive the commutation relations on proper null surfaces in a curved space-time and on null infinities. The explicit expression for theS matrix in an asymptotically simple space-time is presented. The general expression for a density matrix describing particles created in an external field is also given and its possible applications are discussed briefly.
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Frolov, V.P. Null surface quantization and quantum theory of massless fields in asymptotically flat space-time. Gen Relat Gravit 10, 833–852 (1979). https://doi.org/10.1007/BF00756663
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DOI: https://doi.org/10.1007/BF00756663