physics

Ryogo Kubo

Ryogo Kubo 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 Ryogo Kubo rather than just read about it. In short: Ryogo Kubo (久保亮五, Kubo Ryōgo; February 15, 1920 – March 31, 1995) was a Japanese mathematical physicist, best known for his works in statistical physics and non-equilibrium statistical mechanics. Work In the early 1950s, Kubo transformed research into the linear response properties of near-equilibrium condensed-matter systems, in particular the understanding of electron transport and conductivity, through the Kubo…

Key takeaways

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

Reference excerpt

Work In the early 1950s, Kubo transformed research into the linear response properties of near-equilibrium condensed-matter systems, in particular the understanding of electron transport and conductivity, through the Kubo formalism, a Green's function approach to linear response theory for quantum systems. In 1977 Ryogo Kubo was awarded the Boltzmann Medal for his contributions to the theory of non-equilibrium statistical mechanics, and to the theory of fluctuation phenomena. He is cited particularly for his work in the establishment of the basic relations between transport coefficients and equilibrium time correlation functions: relations with which his name is generally associated.

Publications Books available in English Statistical mechanics : an advanced course with problems and solutions / Ryogo Kubo, in cooperation with Hiroshi Ichimura, Tsunemaru Usui, Natsuki Hashitsume (1965, 7th edit.1988) Many-body theory : lectures / edited by Ryōgo Kubo (1966) Dynamical processes in solid state optics / edited by Ryōgo Kubo and Hiroshi Kamimura(1967) Thermodynamics : an advanced course with problems and solutions / Kubo Ryogo (1968) Statistical physics of charged particle systems / edited by Ryogo Kubo and Taro Kihara (1969) Solid state physics / edited by Ryogo Kubo and Takeo Nagamiya; translator, Scripta-Technica, Inc.; editor of English ed., Robert S. Knox (1969) Physics of quantum fluids / edited by Ryōgo Kubo and Fumihiko Takano (1971) Relaxation of elementary excitations : proceedings of the Taniguchi International Symposium, Susono-shi, Japan, October 12–16, 1979 / editors, R. Kubo and E. Hanamura (1980) Selected papers of professor Ryogo Kubo on the occasion of his sixtieth birthday / edited by Executive Committee on the Commemoration of Professor Kubo's Sixtieth Birthday (1980) Statistical physics / M. Toda, R. Kubo, N. Saitō (1983–1985) Equilibrium statistical mechanics / M. Toda, R. Kubo, N. Saitô (1983 2nd edit. 1992) Nonequilibrium statistical mechanics / R. Kubo, M. Toda, N. Hashitsume (1985 2nd edit. 1991) Evolutionary trends in the physical sciences : proceedings of the Yoshio Nishina centennial symposium, Tokyo, Japan, December 5–7, 1990 (1991) Articles Ryogo Kubo; Kazuhisa Tomita (1954). "A General Theory of Magnetic Resonance Absorption". Journal of the Physical Society of Japan. 9 (6). Physical Society of Japan: 888–919. Bibcode:1954JPSJ....9..888K. doi:10.1143/JPSJ.9.888. Kubo, Ryogo (1957). "Statistical-mechanical theory of irreversible processes. 1. general theory and simple applications to magnetic and conduction problems". J. Phys. Soc. Jpn. 12 (6): 570. Bibcode:1957JPSJ...12..570K. doi:10.1143/JPSJ.12.570. – cited more than 4300 times on Web of Science.

See also Brendan Scaife List of notable textbooks in statistical mechanics Timeline of thermodynamics, statistical mechanics, and random processes

References

External links A Japanese physicist's view of Leiden (In 1981 Kubo was Lorentz Professor in Leiden) Publication list. Kyoto University.

Worked examples

Example 1 — a first encounter with Ryogo Kubo

Start with the simplest possible case. Write down what Ryogo Kubo 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 Ryogo Kubo 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 Ryogo Kubo 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 Ryogo Kubo

In research: Ryogo Kubo 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 Ryogo Kubo 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: Ryogo Kubo is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1920 births, 1995 deaths, 20th-century Japanese physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Ryogo Kubo 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 Ryogo Kubo in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ryogo Kubo 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 Ryogo Kubo out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ryogo Kubo in simple terms?

Ryogo Kubo (久保亮五, Kubo Ryōgo; February 15, 1920 – March 31, 1995) was a Japanese mathematical physicist, best known for his works in statistical physics and non-equilibrium statistical mechanics. Work In the early 1950s, Kubo transformed research into the linear response properties of near-equilib…

Why does Ryogo Kubo 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 Ryogo Kubo?

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 Ryogo Kubo.