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 Jul 24 accepted The universality of the Stuart-Landau equation to describe nonlinear oscillators Feb 20 awarded Tumbleweed Feb 13 asked The universality of the Stuart-Landau equation to describe nonlinear oscillators Dec 15 accepted WKB method of approximation Dec 15 revised WKB method of approximation added 1 characters in body Dec 15 comment WKB method of approximation Yes there should. Good catch. Thanks Fabian. I see so only a classical approximation. Interesting. Dec 15 accepted Does a particle in a spherically symmetric infinite square well potential exert a force on the inner and outer shell barrier? Dec 15 comment Does a particle in a spherically symmetric infinite square well potential exert a force on the inner and outer shell barrier? Oops yeah. No I have the ground-state energy. I already calculated that. I'll see what I can come up with. Thanks for the help. Dec 15 awarded Scholar Dec 15 awarded Supporter Dec 15 comment Does a particle in a spherically symmetric infinite square well potential exert a force on the inner and outer shell barrier? Ok. My math is a bit weak I guess. I'm having trouble translating this into anything worthwhile. I have a volume $$V = 4 \pi r*(b-a)$$ and energy $$E_0$$. How would I calculate the pressure? Thanks for the answer by the way. It makes sense when you see the change in ground-state energy. Dec 15 comment Does a particle in a spherically symmetric infinite square well potential exert a force on the inner and outer shell barrier? Hmm. I don't quite understand what you mean when you say, "The pressure follows from equating the energy increase to the integral of PdV." Can you clarify this for me? Is P the pressure and V the volume of the annular container? Dec 15 comment Does a particle in a spherically symmetric infinite square well potential exert a force on the inner and outer shell barrier? Particles don't like to be trapped and exert a sort of pressure on their boundaries. The force tries to push the boundaries out such that the particle is free. Dec 15 asked Does a particle in a spherically symmetric infinite square well potential exert a force on the inner and outer shell barrier? Dec 14 awarded Student Dec 13 comment WKB method of approximation It looks like I want to use the variational principle. I'm still curious If its possible with WKB though. Dec 13 asked WKB method of approximation Oct 23 awarded Editor