physics

John Kogut

John Kogut is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand John Kogut rather than just read about it. In short: John Benjamin Kogut (6 March 1945) is an American theoretical physicist, specializing in high energy physics. Kogut was born in Brooklyn in 1945.

Key takeaways

John Kogut belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect John Kogut to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of John Kogut from memory before moving on to harder problems.

Reference excerpt

John Benjamin Kogut (6 March 1945) is an American theoretical physicist, specializing in high energy physics. Kogut was born in Brooklyn in 1945. Kogut received in 1971 his PhD from Stanford University under James Bjorken with thesis Quantum electrodynamics at infinite momentum: applications to high energy scattering. From 1971 to 1973 he was a visiting scholar at the Institute for Advanced Study and from 1971 to 1977 assistant professor of physics at Cornell University. For 27 years he was on the physics faculty of the Loomis Laboratory at the University of Illinois Urbana-Champaign, retiring in 2005 as professor emeritus. Since then, he has been a program manager at the United States Department of Energy, Office of Science (SC), Office of High Energy Physics. Kogut is known for the Kogut–Susskind fermion and his collaboration with Leonard Susskind on the Hamiltonian formulation of Kenneth G. Wilson's lattice gauge theory. He also did research on the "infinite-momentum frame" (the subject of his PhD thesis) and the parton model. Kogut played a leading role in opposing the Strategic Defense Initiative (aka "Star Wars") in the 1980s. From 1976 to 1978 he was a Sloan Fellow. In 1982 he was elected a Fellow of the American Physical Society. For the academic year 1987–1988 he was a Guggenheim Fellow.

Selected publications

Articles Introduction to lattice gauge theory and spin systems, Reviews of Modern Physics, vol. 51, 1979, pp. 659–713 doi:10.1103/RevModPhys.51.659 with Kenneth G. Wilson: The Renormalization Group and the ϵ {\displaystyle \epsilon } -Expansion, Physics Reports, vol. 12, 1975, pp. 75–199 doi:10.1016/0370-1573(74)90023-4 with Leonard Susskind: Everything you always wanted to know about partons, but were afraid to ask, Physics Reports vol. 8, 1973, p. 75

Books with Michail Stephanov: The phases of Quantum Chromodynamics, Cambridge University Press 2004 Introduction to relativity, Academic Press 2001

References

Worked examples

Example 1 — a first encounter with John Kogut

Start with the simplest possible case. Write down what John Kogut claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to John Kogut before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about John Kogut ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of John Kogut

In research: John Kogut appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses John Kogut in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: John Kogut is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1945 births, 21st-century American physicists, Fellows of the American Physical Society, so understanding it makes those chapters shorter.
In everyday life: Look for John Kogut outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study John Kogut in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what John Kogut means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain John Kogut out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is John Kogut in simple terms?

John Benjamin Kogut (6 March 1945) is an American theoretical physicist, specializing in high energy physics. Kogut was born in Brooklyn in 1945.

Why does John Kogut matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study John Kogut?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on John Kogut.