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Results tagged with perturbation-theory
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user 4864
Perturbation theory refers to methods for understanding physical systems by treating them as small modifications to exactly solvable systems.
5
votes
How can perturbativity survive renormalization?
This also bothered me briefly when learning renormalization. You first assume that $\delta\lambda$ is small throughout, which means that you make a cutoff first, and take $\lambda$ small enough so tha …
27
votes
What does a non-perturbative theory mean?
A nonperturbative theory means a theory where all the results can be calculated in principle to arbitrary accuracy on a computer. This is really just the same as a well-defined theory, a theory which …
0
votes
Most suitable metric for the Solar system?
You just add the metric in isotropic form. You need the isotropic Schwartschild solution, which is found by transforming the r coordinate so that the metric looks like:
$$ - g_{00}(u) dt^2 + g_{uu}(u …
12
votes
Accepted
Time-Dependent Potentials in Quantum Mechanics
There are several methods, and several reasons.
Sepration of variables is not
The method of "separation of variables" is a misnomer in this exact context. What separation of variables really means i …