Introduction to Perturbation Theory
April 6, 2010
Bailey Hall 207
Refreshments will be served in Bailey 204 at 3:45
Perturbation theory comprises mathematical methods that are used to ﬁnd an approximate solution to a problem which cannot be solved exactly, by starting from the exact solution of a related problem. Perturbation theory is applicable if the problem at hand can be formulated by adding a "small" term to the mathematical description of the exactly solvable problem. Perturbation theory leads to an expression for the desired solution in terms of a power series in some "small" parameter that quantiﬁes the deviation from the exactly solvable problem. The leading term in this power series is the solution of the exactly solvable problem, while further terms describe the deviation in the solution, due to the deviation from the initial problem.
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