The Casimir effect is a weak force that acts between two neutral surfaces in close proximity to each other. It’s usually attractive, but can also be repelling.

Predicted by Hendrik Casimir

The existence of this force was predicted in 1948 by the Dutch physicist Hendrik Casimir.

From quantum field theory, Hendrik Casimir concluded that two neutral surfaces in close proximity to each other would attract each other. Due simply to the limited number of wavelengths that can exist in an enclosed space.

The energy density of the enclosed space would be less than outside of it. Because fewer wavelengths can exist in the space between the surfaces than what can exist in the surrounding space.

So, the energy density of the surrounding space would result in pressure on the plates, forcing them together.

Not as predicted

Using the formulas found in quantum field theory, the force was predicted to be attracting, and never repelling. So, it was a surprise to discover that it was at times repelling.

Hendrik Casimir’s prediction was correct as far as the existence of a force was concerned. The actual measurements confirmed the existence of something real. But they could hardly be seen as a validation of quantum field theory.

Alternative explanations

So, a number of alternative explanations have since been proposed. There is a purely relativistic solution, based on the van der Waals force, and there’s a coupled ground-state energy solution.

It has also been suggested that the Casimir Effect is merely polarization at the subatomic.

But the phenomenon can also be explained in terms of the model presented in my book.

The Casimir Effect as a feature of the aether

If we allow for an aether of zero-point particles, the Casimir Effect comes out as a weak force that can be either attracting or repelling. Depending on what materials are used.

An electron in an aether of zero-point particles

To illustrate, we can imagine two neutral plates placed close together.

They would act as shields, restricting the entry of zero-point particles into the space between them.

However, such shields would be far from perfect. Zero-point particles are very small, and have little trouble tunneling through materials. But some particles will bounce off of atoms in the shields.

Trapped particles

The easiest way to enter or leave the enclosed space will always be through the sides where there are no shields.

However, when the opening to the sides get very narrow, only zero-point particles coming in from a very restricted angle are allowed into the enclosed space the easy way. Most of the particles will have to go through the shields.

On the other hand, zero-point particles inside the enclosed space may have little trouble finding their way out.

On average, the exit may be easier to find than the entrance, which would lead to a weak attracting force.

However, there may also be cases where the entrance is easier to find than the exit, which would lead to a weak repelling force.