Perturbation theory and Multiploe expansion

[krasmus]

Like any complex system in physics, it is best to break down the system to its most basic part. Create a ‘toy model’ and add complexity to it. Of course the toy model should be mostly accurate otherwise the perturbation becomes larger than the original system which leads to the model becoming too complicated. Therefore, we have this multipole expansion where higher order poles are ignored as they become negligible as compared to lower order pole terms.

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