Why does gravity not explain the Casimir Effect?

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SUMMARY

The Casimir Effect is primarily attributed to quantum vacuum fluctuations in the electromagnetic field rather than gravitational forces. When the distance between the plates is significantly smaller than their size, gravitational force remains relatively constant, while the attractive force due to quantum fluctuations diminishes rapidly with increasing distance. This phenomenon highlights the importance of quantum mechanics in explaining forces at microscopic scales, contrasting with classical gravitational theories. Experts continue to debate whether these fluctuations should be categorized as vacuum fluctuations or as matter fluctuations akin to the van der Waals force.

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Nick Bratcamp
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Please explain how the gravitational effects are accounted for in the Casimir Effect? At a basic level, I want to understand why the quantum vacuum fluctuations in the electromagnetic field are the cause of the attractive force rather than gravity.
 
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When the distance between plates is much smaller than the size of the plates, the gravitational force does not depend much on the distance. On the other hand, experiments show that the force rapidly decreases with the distance, which can be correctly explained by quantum fluctuations.

There is some dispute among experts whether these quantum fluctuations should be viewed as vacuum fluctuations or matter fluctuations (van der Waals force).
 
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