Quantum field theory Definition and 559 Threads

In short, the question is, how is the position operator related to the position-parameters of a quantum field ψ(x)? For instance, consider a quantum-mechanical state of two particles |Ψ>. This can be expanded in terms of the position eigenstates |x1,x2> to give the position representation...

I noticed that some copies of this book are available at Amazon for as low as $13.00, and increbible price. I just ordered a copy for my self. If anyone else is interested, they are here:

The propagation of something, photon or particle, can have many possible paths, thus the Feynman path integral formulation of quantum mechanics. The initial position is relatively fixed and the final position is relatively fixed (compared to all of space). But it's path from beginning to end can...

Does anyony know of a good, cheap (Perhaps Free :biggrin: ) book that will teach me the basics of quantum field theory. I am a very new beginner, so I will need something simple please. thanks.

If a photon was made from more than one particle, how would quantum field theory be modified?

could anyone suggest a good quantum field theory text? i mean a text for a beginner who is familiar with basic quantum mechanics...also, since i am going to study it by myself( i am not taking a physics course ), a text that is simple in language and informal would be great.(i mean, like...

Greetings, I have question regarding the mathematica foundations of QFT. As I understand, the "regular" QM (Schrödinger, Heisenberg...) been developped so that the math underlying it checks out. Is this the case for QFT, or is the theory still "iffy" at points? I know it works well...

I believe that the Axioms for TQFT were set out by Atiyah in 1990 and that one of the equivalent definitions of a TQFT is in category terms: a TQFT is a functor from the category of n-dimensional cobordisms to the category of Hilbert spaces, satisfying certain conditions. Is anyone familiar...

Hello everyone! This is the rebirth of my thread in PF v2.0 entitled "Do you know QM and SR?" Since I started that thread, a 2nd edition of the book (Warren Siegel's Fields) has been released. The url is: http://xxx.lanl.gov/pdf/hep-th/9912205 I'll post some of the more useful comments from...