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Perturbation theory (quantum mechanics)

Name: Anonymous 2009-07-21 18:21

H = H_0 + W
|Psi> = |Psi_0> + y |Psi_1> + y^2 |Psi_2>
En = En0 + y * En1 + y^2 * En2
W = ?
H|Psi_n> = En|Psi>
How many possibilities for W to be this?

Name: 4tran 2009-07-22 6:56

Isn't W just the perturbing potential?
In which case W can be anything?

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