Einj said:Oops... stupid question! Thanks a lot
The propagator in Peskin's theory refers to the Green's function that describes the propagation of a quantum field from one point to another in spacetime. It is used to calculate the probability amplitude for a particle to travel from one point to another in a given amount of time.
There is doubt about the sign of the propagator in Peskin's theory because it has been shown to be inconsistent with certain experimental results, leading to discrepancies and contradictions in calculations. This has led some scientists to question whether the sign of the propagator is correct.
The sign of the propagator affects the overall result of calculations in Peskin's theory, as it is used in various equations and expressions. If the sign is incorrect, it can lead to incorrect predictions and interpretations of experimental data.
There is evidence from experiments such as the Lamb shift and the anomalous magnetic moment of the electron that suggests the sign of the propagator in Peskin's theory may be incorrect. Additionally, inconsistencies have been found in calculations using the current sign of the propagator.
Scientists are actively researching and proposing alternative theories and modifications to the current sign of the propagator in Peskin's theory. They are also conducting experiments and calculations to gather more evidence and validate or refute these proposed changes.