Questions tagged [quantum-field-theory]

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According to Heisenberg, is quantum theory merely a calculation procedure for predictions?

Is quantum theory just a mathematical tool for correct predictions, according to Heisenberg's views? What are his personal ontological commitments in relation to quantum theory (if he had any ...
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How has the modelling of classical electrodynamics changed since Maxwell?

Maxwell published his Treatise on Electricity and Magnetism in 1873, 150 years ago; before the discovery of quantized charges, special relativity, quantum field theory etc. How has the mathematical ...
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Origin of the term "field" (in "vector field")

I am reposting a thread from "physics stack exchange" : I was wondering - Why do we use the word "field" to describe a vector field? i.e., a field is "an expanse of open or ...
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Who was the first one to rigorously show that quantum fields are operator-valued distributions?

Any Wightman-based approach to Axiomatical Quantum Field Theory states that quantum fields are (operator-valued) distributions. Is there a first rigorous proof of this fact which became trivial as ...
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Original derivation of the Dyson equation

In what paper did Dyson derive the Dyson equation, as shown on Wikipedia?
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When the concept of "Ultraviolet completion" of a low energy effective theory first arose?

In modern view any quantum field theory that has any reason (mathematical or physical) to not be tenable at some short length scale is assumed to be replaced by a more fundamental theory, that we call ...
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Looking for the source of a quote in QFT history

Since it is a strictly physics-related quote i thought this was the best place to ask. It goes something like: "There are no particles, only fields", to which X replied "there are no ...
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Quantum chromodynamics - an origin of the name

A theory of strong interaction is called quantum chromodynamics (QCD). Particles interacting strongly are supposed to have color charge, for example quarks appear in three "mutations" - red, green and ...
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Historically how it was discovered that we need fields to describe matter?

This question is from one historical perspective. The question is: how physicists historically found out that one needs quantum fields to describe matter? Being more detailed. Let us consider the ...
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What is the history and motivation for the (d-1,1) notation used to describe a field theory?

Very often in the literature of research papers and other articles, and maybe text books, on topics of quantum field theory, a theory may be described as a 3+1 or 0+1, or maybe even 1+1 theory. I ...
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Origin of heat kernel regularization

One of the ones the make the infinite vacuum zero point energy finite is to use the heat kernel regularization. Does anyone know the origin of this method? Or the first paper published discussing such ...
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Who first proposed the "colour" charge?

Does anybody know a paper or sorts in which the term "colour" charge in QCD was introduced first? Or any other source in which this label was proposed?
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During the development of QFT was this theory actually used to build any invention like the MRI?

I have always wondered if the equations of quantum field theory were actually ever used in the production of some invention or device other than needed to make predictions about the Standard Model of ...
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Why isn't the ${\gamma}^5$ matrix called ${\gamma}^4$?

This is not really a physical question, but it relates to notation in QED. The ${\gamma}^5$ matrix is defined as $${\gamma}^5=i{\gamma}^0 {\gamma}^1{\gamma}^2{\gamma}^3$$ Wouldn't it be more ...
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History of the fock space based quantization of fields

In almost all Quantum Field Theories textbooks the same approach to quantization is presented as the first example: one considers the scalar real Klein-Gordon field $\phi$ and just write it as $$\phi(...
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The origin of Renormalization Group

Polyakov remembers the development of Renormalization Group and Conformal Bootstrap as "With the use of the ingenious technique, developed by Gribov and Migdal [1] in the problem of reggeons, I found ...
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Does anyone know the physics student who passed a quantum mechanics oral exam without taking quantum mechanics?

Many years ago I read an interview with a physics professor, where he recounted a funny situation when he was a graduate student at Harvard. When a first year, he was supposed to take the quantum ...
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What is the origin of the "virtual particle pair" metaphor for vacuum fluctuations?

In any layman level description of vacuum fluctuations in quantum field theory the fluctuations are described as a pair of virtual particles spontaneously appearing then disappearing within some short ...
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How were particle physics calculations done before Feynman diagrams?

I've seen and read that calculations before Feynman diagrams involved solving differential equations, but I can't find sample calculations like these. I've read that they would take months and pages ...
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What was the first journal to have Feynman Diagrams?

I'm writing a paper on the history of Feynman diagrams and am having trouble finding the first paper published by Feynman which features a calculation done with Feynman Diagrams.
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Why isn't Feynman's path integral taught more widely and earlier in today's academic physics curricula?

Anyone who has studied Feynman's path integral will know that it makes quantum mechanics more like classical mechanics. A student who has learned about the Lagrangian will easily understand the ...
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