Abstract
The problem of the direction of electromagnetic time, i.e., the complete dominance of retarded electromagnetic radiation over advanced radiation in the universe, is considered in the context of a generalized form of the Wheeler-Feynman absorber theory in an open expanding universe with a singularity atT=0. It is shown that the application of a four-vector reflection boundary condition at the singularity leads to the observed dominance of retarded radiation; it also clarifies the role of advanced and retarded waves in the emission of very weakly absorbed radiation such as neutrinos.
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Cramer, J.G. The arrow of electromagnetic time and the generalized absorber theory. Found Phys 13, 887–902 (1983). https://doi.org/10.1007/BF00732064
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DOI: https://doi.org/10.1007/BF00732064