Casimir effect: threshhold distance?

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nomadreid
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In the Casimir effect, there is a distance d between the plates where the effect is observable. Is this a threshhold effect, so that for any non-zero distance [itex]\delta[/itex], the effect is not observable at d+[itex]\delta[/itex], or does this effect taper off? What does this depend on?
 

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Vanadium 50
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It is a strong function of distance: 1/r6 or 1/r8.
 
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nomadreid
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It is a strong function of distance: 1/r6 or 1/r8.

Interesting. Thank you. I should get more into the math involved.
 

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