Question

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(Topic: Interaction between fields: Tight-rope-walking electrons).
"Warning! This is for 4th year bachelor physics student "

The fact that a field can interact with itself. With solids as well as in nuclear phyics we often have to deal with interactions between fields. For example, electrons in solids interact with lattice vibrations or with a quantized light field

Answer 1

To show how to handle interaction problems of this kind, let us consider a nice concrete example. Consider a string ("rope") on which particles (e.g, electrons) may walk, these particles being subject to gravity. We shall, however, ignore the effect of gravity on the string. Our problem is, therefore, in the truest sense one of "tight-rope-walking" electrons (see picture below).

Answer 2

what kind of physics is this

Answer 3

i dont know what q(x,t) stand for , charge?

Answer 4

Quantum Fields Theory of Solids, written by Hakken