2022/06/08

Carlo Rovelli - Wikipedia

Carlo Rovelli - Wikipedia

Carlo Rovelli

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Carlo Rovelli
Carlo Rovelli crop.jpg
Rovelli in 2005
Born3 May 1956 (age 66)
Verona, Italy
NationalityItalian
Alma mater
Known for
Awards
  • Prix du Rayonnement International (2004)
  • 1995 International Xanthopoulos Award
Scientific career
FieldsTheoretical physics
Institutions
Doctoral advisorMarco Toller
InfluencesChris Isham
Signature
Carlo Rovelli signature.jpg

Carlo Rovelli is an Italian theoretical physicist and writer who has worked in Italy, the United States and, since 2000, in France.[1] He is also currently a Distinguished Visiting Research Chair at the Perimeter Institute.[2] He works mainly in the field of quantum gravity and is a founder of loop quantum gravity theory. He has also worked in the history and philosophy of science. He collaborates with several Italian newspapers, including the cultural supplements of the Corriere della Sera, Il Sole 24 Ore and La Repubblica.

His popular science book, Seven Brief Lessons on Physics, was originally published in Italian in 2014. It has been translated into 41 languages[3] and has sold over a million copies worldwide.[4] In 2019, he was included by Foreign Policy magazine in a list of 100 most influential global thinkers.[5]

Life and career[edit]

Carlo Rovelli was born in Verona, Italy, on 3 May 1956. He attended the Liceo Classico Scipione Maffei in Verona. In the 1970s, he participated in the student political movements in Italian universities. He was involved with the free political radio stations Radio Alice in Bologna and Radio Anguana in Verona, which he helped found.[6] In conjunction with his political activity, he was charged, but later released, for crimes of opinion related to the book Fatti Nostri, which he co-authored with Enrico Palandri, Maurizio Torrealta, and Claudio Piersanti.[7]

Rovelli has credited his use of LSD at this time with sparking his interest in theoretical physics, saying of his experience: "it was an extraordinarily strong experience that touched me also intellectually... Among the strange phenomena was the sense of time stopping. Things were happening in my mind but the clock was not going ahead; the flow of time was not passing any more... And I thought: ‘Well, it’s a chemical that is changing things in my brain. But how do I know that the usual perception is right, and this is wrong? If these two ways of perceiving are so different, what does it mean that one is the correct one?"[8]

In 1981, Rovelli graduated with a BS/MS in physics from the University of Bologna, and in 1986 he obtained his PhD at the University of Padova, Italy. Rovelli refused military service, which was compulsory in Italy at the time, and was therefore briefly detained in 1987.[9] He held postdoctoral positions at the University of Rome, the International School for Advanced Studies in Trieste, and Yale University. Rovelli was on the faculty of the University of Pittsburgh from 1990 to 2000,[10] where he was also affiliated with the Department of History and Philosophy of Science. Since 2000 he has been a professor at the Centre de Physique Théorique de Luminy of Aix-Marseille University in France.[11]

He is in a long term relationship with his former PhD student Francesca Vidotto.

Main contributions[edit]

Loop quantum gravity[edit]

In 1988, Rovelli, Lee Smolin and Abhay Ashtekar introduced a theory of quantum gravity called loop quantum gravity. In 1995, Rovelli and Smolin obtained a basis of states of quantum gravity, labelled by Penrose's spin networks, and using this basis they were able to show that the theory predicts that area and volume are quantized. This result indicates the existence of a discrete structure of space on a very small scale. In 1997, Rovelli and Michael Reisenberger introduced a "sum over surfaces" formulation of the theory, which has since evolved into the currently covariant "spinfoam" version of loop quantum gravity. In 2008, in collaboration with Jonathan Engle and Roberto Pereira, he has introduced the spin foam vertex amplitude which is the basis of the current definition of the loop quantum gravity covariant dynamics. Loop theory is today considered a candidate for a quantum theory of gravity. It finds applications in quantum cosmology, spinfoam cosmology and quantum black hole physics.

Physics without time[edit]

In his 2004 book, Quantum Gravity, Rovelli developed a formulation of classical and quantum mechanics that does not make explicit reference to the notion of time. The first step towards a theory of quantum gravity without a time variable is described by Wheeler–DeWitt equation. The timeless formalism is used to describe the world in the regimes where the quantum properties of the gravitational field cannot be disregarded. This is because the quantum fluctuation of spacetime itself makes the notion of time unsuitable for writing physical laws in the conventional form of evolution laws in time.

This position led him to face the following problem: if time is not part of the fundamental theory of the world, then how does time emerge? In 1993, in collaboration with Alain Connes, Rovelli proposed a solution to this problem called the thermal time hypothesis. According to this hypothesis, time emerges only in a thermodynamic or statistical context. If this is correct, the flow of time is not fundamental, deriving from the incompleteness of knowledge. Similar conclusions had been reached earlier in the context of nonequilibrium statistical mechanics, in particular in the work of Robert Zwanzig, and in Caldeira-Leggett models used in quantum dissipation.[12][13]

Relational quantum mechanics[edit]

In 1994, Rovelli introduced the relational interpretation of quantum mechanics, based on the idea that the quantum state of a system must always be interpreted relative to another physical system (like the "velocity of an object" is always relative to another object, in classical mechanics). The idea has been developed and analyzed in particular by Bas van Fraassen[14] and by Michel Bitbol. Among other important consequences, it provides a solution of the EPR paradox that does not violate locality.[15] Rovelli has expressed the main idea of relational quantum mechanics in the popular book Helgoland.

Relative information[edit]

Rovelli won the second prize in the 2013 FQXi contest "It From Bit or Bit From It?" for his essay about "relative information". His paper, Relative Information at the Foundation of Physics, discusses how "Shannon’s notion of relative information between two physical systems can function as [a] foundation for statistical mechanics and quantum mechanics, without referring to subjectivism or idealism...[This approach can] represent a key missing element in the foundation of the naturalistic picture of the world."[16] In 2017, Rovelli elaborated further upon the subject of relative information, writing that:

In nature, variables are not independent; for instance, in any magnet, the two ends have opposite polarities. Knowing one amounts to knowing the other. So we can say that each end “has information” about the other. There is nothing mental in this; it is just a way of saying that there is a necessary relation between the polarities of the two ends. We say that there is "relative information" between two systems anytime the state of one is constrained by the state of the other. In this precise sense, physical systems may be said to have information about one another, with no need for a mind to play any role. Such "relative information" is ubiquitous in nature: The colour of the light carries information about the object the light has bounced from; a virus has information about the cell it may attach, and neurons have information about one another. Since the world is a knit tangle of interacting events, it teems with relative information. When this information is exploited for survival, extensively elaborated by our brain, and may be coded in a language understood by a community, it becomes mental, and it acquires the semantic weight that we commonly attribute to the notion of information. But the basic ingredient is down there in the physical world: physical correlation between distinct variables. The physical world is not a set of self-absorbed entities that do their selfish things. It is a tightly knitted net of relative information, where everybody’s state reflects somebody else’s state. We understand physical, chemical, biological, social, political, astrophysical, and cosmological systems in terms of these nets of relations, not in terms of individual behaviour. Physical relative information is a powerful basic concept for describing the world. Before “energy,” “matter,” or even “entity.”[17]

History and philosophy of science[edit]

Carlo Rovelli, Rome 2015

Rovelli has written a book on the Greek philosopher Anaximander, published in France, Italy, US[18] and Brazil. The book analyses the main aspects of scientific thinking and articulates Rovelli's views on science. Anaximander is presented in the book as a main initiator of scientific thinking.

For Rovelli, science is a continuous process of exploring novel possible views of the world;[19] this happens via a "learned rebellion", which always builds and relies on previous knowledge but at the same time continuously questions aspects of this received knowledge.[20] The foundation of science, therefore, is not certainty but the very opposite, a radical uncertainty about our own knowledge, or equivalently, an acute awareness of the extent of our ignorance.[20]

Religious views[edit]

Rovelli defines himself "serenely atheist".[21] He discussed his religious views in several articles and in his book on Anaximander. He argues that the conflict between rational/scientific thinking and structured religion may find periods of truce ("there is no contradiction between solving Maxwell's equations and believing that God created Heaven and Earth"),[22] but it is ultimately unsolvable because (most) religions demand the acceptance of some unquestionable truths while scientific thinking is based on the continuous questioning of any truth. Thus, for Rovelli, the source of the conflict is not the pretense of science to give answers – the universe, for Rovelli is full of mystery and a source of awe and emotions – but, on the contrary, the source of the conflict is the acceptance of our ignorance at the foundation of science, which clashes with religions' pretense to be depositories of certain knowledge.[22]

Main awards[edit]

  • 1995 International Xanthopoulos Award of the International Society for General Relativity and Gravitation, "for outstanding contributions to theoretical physics"[23]
  • Senior member of the Institut Universitaire de France
  • Laurea Honoris Causa National University of General San Martín[24]
  • Honorary Professor of the Beijing Normal University in China
  • Member of the Académie Internationale de Philosophie des Sciences
  • Honorary member of the Accademia di Scienze Arti e Lettere di Verona
  • 2009 First "community" prize of the FQXi contest on the "nature of time"
  • 2013 Second prize of the FQXi contest on the "relation between physics and information"
  • 2014 Premio Letterario Merck [it] for the book Reality Is Not What It Seems: The Journey to Quantum Gravity
  • 2015 Premio Pagine di Scienza di Rosignano for the book Reality Is Not What It Seems: The Journey to Quantum Gravity[25]
  • 2015 Premio Alassio centolibri per l’informazione culturale[26]
  • 2015 Premio Larderello[27]
  • 2015 Premio letterario Galileo per la divulgazione scientifica [it] for the book Reality Is Not What It Seems: The Journey to Quantum Gravity

Popular culture[edit]

Books and articles[edit]

Rovelli has written more than 200 scientific articles published in international journals. He has published two monographs on loop quantum gravity and several popular science books. His book, Seven Brief Lessons on Physics, has been translated into 41 languages.

Scientific books[edit]

Popular books[edit]

  • (In preparation) Anaximander: And the Birth of Science, Penguin Random House February 2, 2023 [34]
  • Helgoland, Penguin Random House 2021 / Helgoland, Adelphi, 2020.
  • There Are Places in the World Where Rules Are Less Important Than Kindness, Penguin Random House, 2020 / Ci sono luoghi al mondo dove più che le regole è importante la gentilezza, Solferino, 2020.
  • The Order of Time, Penguin Random House, 2018 / L'ordine del tempo, Adelphi, 2017.
  • Reality Is Not What It Seems: The Journey to Quantum Gravity, Penguin Random House, 2016 / La realtà non è come ci appare: La struttura elementare delle cose, Raffaello Cortina Editore, 2014.
  • Seven Brief Lessons on Physics, Penguin Random House, 2015 / Sette brevi lezioni di fisica, Adelphi, 2014.
  • The first scientist Anaximander and his legacy, Westholme Publishing, 2011 / Che cos'è la Scienza. La rivoluzione di Anassimandro., Mondadori, 2012.
  • What is time, what is space? (interview), Di Renzo Editore, 2006 / Che cos'é il tempo, che cos'é lo spazio?, Di Renzo Editore, 2004.

Main scientific papers[edit]

References[edit]

  1. ^ "Resume" (PDF). www.cpt.univ-mrs.fr.
  2. ^ "Facultypage". www.perimeterinstitute.ca.
  3. ^ en:List of literary works by number of translations
  4. ^ Carlo Rovelli (2017-07-25). "Carlo Rovelli: 'I felt the beautiful adventure of physics was a story that had to be told'". The Guardian. Retrieved 2018-04-05.
  5. ^ "2019 Global Thinkers". Foreign Policy. 2019-01-12.
  6. ^ Carlo Rovelli, "Fatti Nostri".
  7. ^ "Fatti Nostri", Bertani editore, 1977, (re-edited Rimini, Nda Press, 2007), ISBN 978-88-89035-17-7
  8. ^ Higgins, Charlotte (April 14, 2018). "'There is no such thing as past or future': physicist Carlo Rovelli on changing how we think about time". The Guardian. Retrieved January 10, 2022.
  9. ^ Carlo Rovelli, "Cos'è il tempo? Cos'è lo spazio?".
  10. ^ "Archived copy". archivio.festivaldelleletterature.it. Archived from the original on 21 May 2012. Retrieved 14 January 2022.
  11. ^ Laurent, Lionel (29 February 2008). "Is Time Just A Trick Of The Mind?". Forbes.com. Retrieved 4 January 2011.
    - Carlo Rovelli. "Carlo Rovelli forecasts the future". New Scientist. Retrieved 4 January 2011.
  12. ^ Zwanzig, R. (1973). "Nonlinear generalized Langevin equations". Journal of Statistical Physics. 9 (3): 215–220. Bibcode:1973JSP.....9..215Z. doi:10.1007/BF01008729. S2CID 121594079.
  13. ^ Caldeira, A. O.; Leggett, A. J. (1981). "Influence of Dissipation on Quantum Tunneling in Macroscopic Systems". Physical Review Letters. 46 (4): 211–214. Bibcode:1981PhRvL..46..211C. doi:10.1103/PhysRevLett.46.211. ISSN 0031-9007.
  14. ^ van Fraassen, Bas C. (11 July 2009). "Rovelli's World" (PDF). Foundations of Physics. 40 (4): 390–417. Bibcode:2010FoPh...40..390V. doi:10.1007/s10701-009-9326-5. S2CID 17217776.
  15. ^ Smerlak, Matteo; Rovelli, Carlo (3 February 2007). "Relational EPR". Foundations of Physics. 37 (3): 427–445. arXiv:quant-ph/0604064. Bibcode:2007FoPh...37..427S. doi:10.1007/s10701-007-9105-0. S2CID 11816650.
  16. ^ Carlo Rovelli, Relative information at the foundation of physics (Marseille, CPT & Toulon U.). October 31, 2013. 3 pp.; Published in "It from Bit or Bit from It? On Physics and information", A Aguirre, B Foster and Z Merali eds., 79-86 (Springer 2015)
    - Carlo Rovelli, Relative information at the foundation of physics, Arxiv.org. Retrieved 2019-10-01.[dead link]
  17. ^ "What scientific term or concept ought to be more widely known? - Relative Information", Edge.org, 2017. Retrieved 13-9-2019
  18. ^ Carlo Rovelli, Anaximandre de Millet, ou la naissance de la science, Dunod, 2009; Che cos'è la scienza. La rivoluzione di Anassimandro, Mondadori Università, 2011; Carlo Rovelli, The first scientist. Anaximander and his legacy, Westholme Publishing, 2011.
  19. ^ Anaximandre de Millet, ou la naissance de la science, pg. 180.
  20. ^ Jump up to:a b Anaximandre de Millet, ou la naissance de la science, pg. 75.
  21. ^ There Are Places in the World Where Rules Are Less Important Than Kindness, Penguin Random House, 2020
  22. ^ Jump up to:a b The First Scientist, pg. 153.
  23. ^ "Award list". ISGRG.
  24. ^ "Carlo Rovelli, doctor Honoris Causa de la UNSAM » Noticias UNSAM". noticias.unsam.edu.ar (in Spanish). Retrieved 2018-04-06.
  25. ^ "Il progetto Pagine di scienza premia il prof Rovelli". Il Tirreno (in Italian). 2015-03-23. Retrieved 2018-04-06.
  26. ^ "Consegnato a Carlo Rovelli il premio "Alassio per l'Informazione Culturale"". Ecodisavona (in Italian). Retrieved 2018-04-06.
  27. ^ "Il quarto Premio Larderello al fisico Carlo Rovelli". il Tirreno (in Italian). 2015-08-18. Retrieved 2018-04-06.
  28. ^ Topolino no. 3175, 2016.
  29. ^ Alan Lightman (2018-05-14). "Benedict Cumberbatch Meets Albert Einstein in Carlo Rovelli's New Audiobook". The New York Times. Retrieved 2019-10-01.
  30. ^ "Professor Carlo Rovelli". BBC Radio 4. BBC. Retrieved 2019-10-01.
  31. ^ "Carlo Rovelli on why time is not what it seems". BBC Radio 4. The Life Scientific. BBC. Retrieved 2020-01-30.
  32. ^ "Carlo Rovelli". BBC Radio 3. 2020.
  33. ^ "A Good Read Nick Hornby & Carlo Rovelli". BBC Radio 4. A Good Read. BBC. Retrieved 2020-01-30.
  34. ^ "Anaximander: And the Birth of Science Kindle Edition". amazon.com. Retrieved 2022-05-18.

External links[edit]

External video
video icon Did you know your head ages more quickly than your feet? Interview with Carlo Rovelli, Matter Of Fact With Stan Grant, ABC News

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