physics

Remo Ruffini

Remo Ruffini 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 Remo Ruffini rather than just read about it. In short: Remo Ruffini (born May 17, 1942, La Brigue, Alpes-Maritimes, at that time, Briga Marittima, Italy) is an Italian astrophysicist. He is the Director of ICRANet, International Centre for Relativistic Astrophysics Network and one of the founders of the International Centre for Relativistic Astrophysics (ICRA).

Key takeaways

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

Reference excerpt

Remo Ruffini (born May 17, 1942, La Brigue, Alpes-Maritimes, at that time, Briga Marittima, Italy) is an Italian astrophysicist. He is the Director of ICRANet, International Centre for Relativistic Astrophysics Network and one of the founders of the International Centre for Relativistic Astrophysics (ICRA). Ruffini initiated the International Relativistic Astrophysics PhD (IRAP PhD), a common graduate school program of several universities and research institutes for the education of theoretical astrophysicists. He is the Director of the Erasmus Mundus IRAP PhD program (IRAP Ph D Erasmus Mundus). He has been Professor of Theoretical Physics at the University of Rome "Sapienza" from 1978 to 2012.

Biography After obtaining his degree in 1966 in Rome, he was a post-doctoral fellow at the Mainz Academy of Sciences working with Pascual Jordan, in West Germany. Then, he was a post-doctoral fellow with John Wheeler and Member of the Institute for Advanced Study in Princeton and later became an instructor and assistant professor at Princeton University. In 1975, he was a visiting professor at the Universities of Kyoto (Japan) and of Western Australia, Perth. In the years 1975–78, he worked with NASA, being a member of the task force on the scientific use of space stations. In 1976 he became professor of theoretical physics at the University of Catania and in 1978 he was appointed a professor at the University "Sapienza". In 1985, he was elected president of the International Center for Relativistic Astrophysics (ICRA). In 1984 he was a cofounder, with Abdus Salam, of the Marcel Grossmann Meetings. In 1987, he became co-chairman of the Italian-Korean Meetings on Relativistic Astrophysics. In the years 1989–93, he was President of the Scientific Committee of the Italian Space Agency. He is the editor of a variety of scientific journals. He is married to Anna Imponente and has a son, Iacopo. His theoretical work led to the concept of boson stars. His classic article with John Wheeler popularized the astrophysical concept of Black Hole. With Demetrios Christodoulou he has given the formula for a Kerr-Newmann Black Hole endowed of charge, mass and angular momentum. His theoretical work led to the identification of the first Black Holes in the Milky Way Galaxy. Together with his student C. Rhoades, he established the absolute upper limit to the mass of neutron stars. With his student Robert Leach, he used such an upper limit for fixing the paradigm which enabled the identification of the first Black Hole in the Milky Way Galaxy, Cygnus X1, using the splendid data of the Uhuru satellite by Riccardo Giacconi and his group. For these works, Ruffini won the A. Cressy Morrison Award of the New York Academy of Sciences in 1972. With his students Calzetti, Giavalisco, Song and Taraglio, Ruffini developed the role of fractal structures in cosmology. Together with his collaborator Thibault Damour, Ruffini suggested the applicability of the Heisenberg-Euler-Schwinger process of pair creation in black hole physics and identified the dyadosphere where these processes take place. Gamma ray bursts seem to give the observational evidence of such pair creation process in astrophysics, prior to the observation of such phenomenon in Earth based experiments and represent the first evidence of the energy extraction process from Black Holes (the blackholic energy).

Books He is co-author of 21 books, including:

R. Giacconi and R. Ruffini, Physics and Astrophysics of Neutron Stars and Black Holes, LXXV E. Fermi Summer School, SIF and North Holland (1978); also translated into Russian R. Giacconi and R. Ruffini, Physics and Astrophysics of Neutron Stars and Black Holes 2nd edition, Cambridge Scientific Publishers, Cambridge (2009) R. Gursky and R. Ruffini, Neutron Stars, Black Holes and Binary X Ray Sources, H. Reidel (1975) H. Ohanian and R. Ruffini. Gravitation and Spacetime, W.W. Norton (1994); translated into Italian (Bologna: Zanichelli, 1997), Chinese (China Science Publishing, 2007) and Korean (Seoul: Shin Won, 2001) Bardeen, et al., Black Holes, Gordon & Breach (1973) M. Rees, J.A. Wheeler and R. Ruffini, Black Holes, Gravitational Waves and Cosmology, Gordon & Breach (1974) H. Sato and R. Ruffini, Black Holes, Tokyo (1976) L.Z. Fang and R. Ruffini, Basic Concepts in Relativistic Astrophysics, Beijing: Science Press (1981) F. Melchiorri and R. Ruffini, Gamow Cosmology, North Holland Pub. Co., (1986)

Awards A. Cressy Morrison Award, from the New York Academy of Sciences (1972) Alfred P. Sloan Fellow Foundation (1974) Space Scientist of the Year (1992) Gravity Research Foundation Award 1970, 1971, 2019

See also Ergosphere Schrödinger–Newton equation

References

External links (in English) web page Remo Ruffini (Publications) ICRANet (IRAP) Archived 2007-07-06 at the Wayback Machine. List of publications Archived 2011-07-16 at the Wayback Machine

Illustrations

Worked examples

Example 1 — a first encounter with Remo Ruffini

Start with the simplest possible case. Write down what Remo Ruffini 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 Remo Ruffini 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 Remo Ruffini 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 Remo Ruffini

In research: Remo Ruffini 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 Remo Ruffini 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: Remo Ruffini is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1942 births, Academic staff of the Sapienza University of Rome, Fellows of the American Physical Society, so understanding it makes those chapters shorter.
In everyday life: Look for Remo Ruffini 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 Remo Ruffini in 20 minutes

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

Frequently asked questions

What is Remo Ruffini in simple terms?

Why does Remo Ruffini 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 Remo Ruffini?

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 Remo Ruffini.