arnold3000

1 hour ago, Mordred said:

Why would the triboelectric effect have any meaning concerning the size of an electron ? The scattering Markus referred to is the Compton scattering this is the probability of a particles locations which is scattered by the photon whose mass must be also be sufficient to cause an electron to be scattered. No matter how much energy we have experimentally used, we have not been able to determine the size or radius of an electron. It is from all experimental evidence literally pointlike, which is such an infinitesimal length that size becomes meaningless.

Care must be taken in the term quanta however. A quanta of action for example requires displacement from one coordinate to another a quanta of action under QFT is a measureable event ie specifically Observable. The field in QFT is upgraded to an operator but under QM is a propagator as the two operators in QM are position and momentum.

Sorry. I want to clarify in the quantum field theory materials are exchanged by electrons which are wave packets?

2 hours ago, Markus Hanke said:

The concept of “size” does not really make much sense in the context of quantum field theory, because you are dealing with excitations of a field that extends throughout all space and time. The only thing you can do is set up a scenario where you let quantum fields interact - for example, you can shoot another particle at your original electron. In this case there will be a well defined probability to “hit” your electron in a specified region, and by the manner of the resultant inelastic scattering, you can draw conclusions as to the internal structure of the electron. 

Such experiments have been done, and the result is that there is no indication of them having any kind of internal structure. At the point of scattering (!) they behave like point particles; however, this is only the point where the quantum fields interact, but the fields themselves extend throughout all space and time, so “size” isn’t really a very meaningful concept in this picture. It’s both a point particle, and an extended field, and the two are equivalent descriptions of the same thing.

And how then does the quantum field theory explain the triboelectricity when the electrons pass from one material to another?

what is the size of an electron in quantum field theory? Art Hobson said that the field quanta spread infinitely

How work triboelectricity in Quantum Field Theory? In classic theory electrons transfer from one object to another. How it work in Quantum Field Theory?