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AdvancedRetardedClassicalGreen’sFunction Propagators G.pdf
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Relative to the emitter the retarded spherical wave expands along the sequence of future light cones along its world line in the future direction. The advanced wave expands along the sequence of past light cones along its world line in the past direction. In contrast, the advanced wave from the future absorber converges on the past emitter in a globally selfconsistent (Igor Novikov) loop in time (John Cramer transaction).[1]
[1] Taking the complex conjugate of the above local fields makes no essential physical change in the above considerations. However, from a global POV the Feynman path quantum amplitudes suggest an advanced interpretation for their complex conjugate because the classical action is a time definite integral of the Lagrangian. Reversing the time limits in definite integral gives the complex conjugate.
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28 Jun 2012
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26 Jun 2012
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