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Asymptotic Analysis of 1-D Schrödinger Equation

+ 2 like - 0 dislike
167 views

I'm looking to do a small personal project regarding the time independent Schrödinger equation in 1-D:

$$y'' +V(x)y=Ey$$

$$y''=Q(x)y$$

where $ Q(x):=E-V(x) $.

There is obviously nothing stopping me now from choosing arbitrary $ Q(x) $ and finding solutions. However, I'm interested in coefficient functions that are actually relevant. I, being of weak physics background don't particularly know which $Q(x)$ would actually be both mathematically and physically intriguing. I'm most interested in evaluating the asymptotic behavior of solutions about some irregular singular point as well as one and two turning point problems. I then want to use Padé approximations and then potentially a Shanks transform on the asymptotic series associated with the asymptotic behavior. So my question stands, which $Q(x)$ should I choose? Many different recommendations would be much appreciated.

This post imported from StackExchange Physics at 2015-02-20 16:50 (UTC), posted by SE-user Seenathin
asked Feb 20, 2015 in Theoretical Physics by Seenathin (10 points) [ no revision ]
Have a look at the lectures by Carl Bender at pirsa.org; he discusses asymptotics, the Schrodinger equation, Pade approximations and the Shanks transform. He also addresses the issue of when $Q(x)$ is zero (which is a problem since the regular WKB approximation becomes singular).

This post imported from StackExchange Physics at 2015-02-20 16:50 (UTC), posted by SE-user JamalS

1 Answer

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Typical potentials of interest are the quartic anharmonic oscillator, where $V(x)=ax^2+bx^3+cx^4$ and the Morse potential where $V(x)=a(1-e^{b(x-x_0)})^2$.

answered Mar 3, 2015 by Arnold Neumaier (12,355 points) [ no revision ]

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