What Is the Casimir Effect?

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SUMMARY

The Casimir Effect is a quantum phenomenon that occurs between two closely spaced flat plates, where the energy density of virtual waves is higher outside the plates than between them. This results in a net attractive force between the plates due to the restriction of certain wavelengths in the confined space. Specifically, only wavelengths that are factors of the distance between the plates can exist within that space, leading to a difference in energy densities. The effect exemplifies the principles of quantum mechanics and vacuum fluctuations.

PREREQUISITES
  • Quantum mechanics fundamentals
  • Understanding of wave-particle duality
  • Concept of vacuum fluctuations
  • Basic knowledge of energy density
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What exactly is the Casimir Effect?
Could somebody explain the basics?
 
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Basically the idea is that all of space is filled with waves of various sorts. (This is a quantum-mechanical thing) Normally, in empty space, there are waves of all different wavelengths, but when you have a small space between two surfaces, only the waves whose wavelengths are factors of the size of the space will exist in that space. Any other waves will be reflected back and forth and cancel each other out. (Example: in a 1cm cavity, you could have waves of 1cm, .5cm, .25cm, etc. but not, say, .7cm)

Now, if you have two flat plates sitting a short distance apart, the waves between them are limited to certain wavelengths. But the waves outside the plates can have any wavelength. So you have a higher energy density on one side of each plate than on the other, and whenever there is a difference of energy densities, you get a force that tries to equalize them. That force is responsible for the Casimir effect.
 
Cool. Thanks!
 

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