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theorems:haags_theorem
Haag's theorem
Intuitive
Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party.
Concrete
For the best explanation, see the section "How to stop worrying about Haag's theorem" in the book "The Conceptual Framework of Quantum Field Theory" by A. Duncan
Abstract
In particular Haag's theorem, that one cannot consistently define the vacuum in interacting theories, is now considered to have been the wrong way to look at the problem, and largely disappears with considerations of RG flow.A Practical Introduction to Quantum Field Theory by Felix Flicker
Why is it interesting?
According to something called Haagís theorem there appears to be no known consistent formalism within which interacting quantum field theory can be expressed.
p. 115 in "An interpretative introduction to quantum Field theory" by Teller (1995)
FAQ
- Why is there no problem in practical QFT calculations?
- see https://physics.stackexchange.com/questions/3983/haags-theorem-and-practical-qft-computations
theorems/haags_theorem.txt · Last modified: 2019/05/08 15:48 by jakobadmin
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