Carlo Rovelli

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Carlo Rovelli
Carlo Rovelli no Fronteiras do Pensamento Sao Paulo 2017 (34781380545).jpg
Rovelli in 2017
Born (1956-05-03) 3 May 1956 (age 68)
Verona, Italy
Nationality
  • Italian
  • American
Alma mater
Known for
Awards
  • Lewis Thomas Prize (2024)
  • (2004)
  • International Xanthopoulos Award (1995)
Scientific career
Fields Theoretical physics
Institutions
Doctoral advisor Marco Toller
Signature
Carlo Rovelli signature.jpg

Carlo Rovelli (born 3 May 1956) is an Italian theoretical physicist and writer who has worked in Italy, the United States, France, and Canada. [1] He is currently Emeritus Professor at the Centre de Physique Theorique of Marseille in France, a Distinguished Visiting Research Chair at the Perimeter Institute, [2] core member of the Rotman Institute of Philosophy of Western University in Canada, [3] and Fractal Faculty of the Santa Fe Institute in The United States. [4]

Contents

Rovelli works mainly in the field of quantum gravity and is a founder of the theory of loop quantum gravity. He has also worked in the history and philosophy of science, formulating the Relational quantum mechanics and the notion of Thermal Time. 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 sold over a million copies worldwide. [5] In 2019, he was included by Foreign Policy magazine in the list of the 100 most influential global thinkers. [6] In 2021, he was included by Prospect magazine in the list of the 50 world's top thinkers. [7]

Life and career

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. [8] 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. [9]

Rovelli has credited his use of LSD at this time with sparking his interest in theoretical physics, [10] 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?" [11]

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 1977. [12] 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, [13] 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. [14]

Main contributions

Loop quantum gravity

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 "spin foam" 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

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. [15] [16]

Relational quantum mechanics

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). [17] The idea has been developed and analyzed in particular by Bas van Fraassen [18] and by Michel Bitbol. Among other important consequences, it provides a solution of the EPR paradox that does not violate locality. [19] Rovelli has expressed the main idea of relational quantum mechanics in the popular book Helgoland .

Relative information

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." [20] 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.” [21]

History and philosophy of science

Rovelli in Rome, 2015 CARLO ROVELLI.jpg
Rovelli in Rome, 2015

Rovelli has written a book on the Greek philosopher Anaximander, published in France, Italy, US [22] 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; [23] 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. [24] 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. [24]

Religious views

Rovelli defines himself as "serenely atheist". [25] 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"), [26] 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 – for Rovelli, the universe 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. [26]

Political engagement, pacifism, and controversies

Rovelli's first book is on the Italian student political movements in the 1970s. [27] He later refused to compulsory military draft and was briefly detained. In 2021, he coordinated the Global Peace Dividend, an open letter signed by more that 50 Nobel Laureates, including the Dalai Lama, calling for all countries to negotiate a balanced cut on their military spending by 2% a year for the next five years, and put half the saved money in a UN fund to combat pandemics, the climate crisis, and extreme poverty. [28]

On 1 May 2023, Rovelli gave a political speech at the large Italian Labour Day concert in Rome, inviting the youth to engage politically for the environment, economical equality and peace, and criticizing the Italian Defence Minister Guido Crosetto for his direct involvement with the industrial military complex. The speech raised a large controversy. [29] As a consequence, his invitation to represent Italy at the 2024 Frankfurt Book Fair was cancelled; the cancellation itself was widely criticized, leading to his re-invitation, [30] and the resignation of the Italian Commissary for the Buchmesse. [31] Rovelli repeated his call for reduced military spending and improved international cooperation following the outbreak of the 2023 Israel–Hamas war. [32] That same year, he was one of the signatories of the International Peace Conference manifesto, which accuses the West (e.g., the United States, the European Union, and NATO) of attacking "Russia with the clear goal to destroy it as a sovereign state". The manifesto goes on to trace this Western aggression as the driving force behind the Russian invasion of Ukraine. [33]

Main awards

Books and articles

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

Related Research Articles

<span class="mw-page-title-main">Quantum gravity</span> Description of gravity using discrete values

Quantum gravity (QG) is a field of theoretical physics that seeks to describe gravity according to the principles of quantum mechanics. It deals with environments in which neither gravitational nor quantum effects can be ignored, such as in the vicinity of black holes or similar compact astrophysical objects, as well as in the early stages of the universe moments after the Big Bang.

In philosophy, the philosophy of physics deals with conceptual and interpretational issues in physics, many of which overlap with research done by certain kinds of theoretical physicists. Historically, philosophers of physics have engaged with questions such as the nature of space, time, matter and the laws that govern their interactions, as well as the epistemological and ontological basis of the theories used by practicing physicists. The discipline draws upon insights from various areas of philosophy, including metaphysics, epistemology, and philosophy of science, while also engaging with the latest developments in theoretical and experimental physics.

<span class="mw-page-title-main">Loop quantum gravity</span> Theory of quantum gravity, merging quantum mechanics and general relativity

Loop quantum gravity (LQG) is a theory of quantum gravity that incorporates matter of the Standard Model into the framework established for the intrinsic quantum gravity case. It is an attempt to develop a quantum theory of gravity based directly on Albert Einstein's geometric formulation rather than the treatment of gravity as a mysterious mechanism (force). As a theory, LQG postulates that the structure of space and time is composed of finite loops woven into an extremely fine fabric or network. These networks of loops are called spin networks. The evolution of a spin network, or spin foam, has a scale on the order of a Planck length, approximately 10−35 meters, and smaller scales are meaningless. Consequently, not just matter, but space itself, prefers an atomic structure.

<span class="mw-page-title-main">Lee Smolin</span> American theoretical physicist (born 1955)

Lee Smolin is an American theoretical physicist, a faculty member at the Perimeter Institute for Theoretical Physics, an adjunct professor of physics at the University of Waterloo, and a member of the graduate faculty of the philosophy department at the University of Toronto. Smolin's 2006 book The Trouble with Physics criticized string theory as a viable scientific theory. He has made contributions to quantum gravity theory, in particular the approach known as loop quantum gravity. He advocates that the two primary approaches to quantum gravity, loop quantum gravity and string theory, can be reconciled as different aspects of the same underlying theory. He also advocates an alternative view on space and time that he calls temporal naturalism. His research interests also include cosmology, elementary particle theory, the foundations of quantum mechanics, and theoretical biology.

<span class="mw-page-title-main">Spin foam</span> Topological structure used in a description of quantum gravity

In physics, the topological structure of spinfoam or spin foam consists of two-dimensional faces representing a configuration required by functional integration to obtain a Feynman's path integral description of quantum gravity. These structures are employed in loop quantum gravity as a version of quantum foam.

The history of loop quantum gravity spans more than three decades of intense research.

<span class="mw-page-title-main">Wheeler–DeWitt equation</span> Field equation, part of a theory that attempts to combine quantum mechanics and general relativity

The Wheeler–DeWitt equation for theoretical physics and applied mathematics, is a field equation attributed to John Archibald Wheeler and Bryce DeWitt. The equation attempts to mathematically combine the ideas of quantum mechanics and general relativity, a step towards a theory of quantum gravity.

In general relativity, the hole argument is an apparent paradox that much troubled Albert Einstein while developing his famous field equations.

Relationalism is any theoretical position that gives importance to the relational nature of things. For relationalism, things exist and function only as relational entities.

This timeline lists significant discoveries in physics and the laws of nature, including experimental discoveries, theoretical proposals that were confirmed experimentally, and theories that have significantly influenced current thinking in modern physics. Such discoveries are often a multi-step, multi-person process. Multiple discovery sometimes occurs when multiple research groups discover the same phenomenon at about the same time, and scientific priority is often disputed. The listings below include some of the most significant people and ideas by date of publication or experiment.

Relational quantum mechanics (RQM) is an interpretation of quantum mechanics which treats the state of a quantum system as being relational, that is, the state is the relation between the observer and the system. This interpretation was first delineated by Carlo Rovelli in a 1994 preprint, and has since been expanded upon by a number of theorists. It is inspired by the key idea behind special relativity, that the details of an observation depend on the reference frame of the observer, and uses some ideas from Wheeler on quantum information.

<span class="mw-page-title-main">Giorgio Parisi</span> Italian physicist (born 1948)

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There is a diversity of views that propose interpretations of quantum mechanics. They vary in how many physicists accept or reject them. An interpretation of quantum mechanics is a conceptual scheme that proposes to relate the mathematical formalism to the physical phenomena of interest. The present article is about those interpretations which, independently of their intrinsic value, remain today less known, or are simply less debated by the scientific community, for different reasons.

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In theoretical physics, the problem of time is a conceptual conflict between general relativity and quantum mechanics in that quantum mechanics regards the flow of time as universal and absolute, whereas general relativity regards the flow of time as malleable and relative. This problem raises the question of what time really is in a physical sense and whether it is truly a real, distinct phenomenon. It also involves the related question of why time seems to flow in a single direction, despite the fact that no known physical laws at the microscopic level seem to require a single direction.

<i>Seven Brief Lessons on Physics</i> 2014 book by Carlo Rovelli

Seven Brief Lessons on Physics is a short book by the Italian physicist Carlo Rovelli. Originally published in Italian in 2014, by 2021 the book has been translated into 52 languages. More than a million copies have been sold, of which more than 400,000 in Italy.

<i>The Order of Time</i> (book) 2017 book by Carlo Rovelli

The Order of Time is a book by Italian physicist Carlo Rovelli, a specialist in quantum gravity research, about time in physics. An audiobook, four hours and nineteen minutes long, was read by Benedict Cumberbatch.

<i>Reality Is Not What It Seems</i> Book by Carlo Rovelli

Reality Is Not What It Seems: The Journey to Quantum Gravity is an illustrated book by Italian physicist Carlo Rovelli. The book discusses quantum gravity. It was first published in Italian in 2014. It was published in English in 2016 by which time the English translation of Seven Brief Lessons had already appeared.

<span class="mw-page-title-main">Francesca Vidotto</span> Female Italian theoretical physicist

Francesca Vidotto is an Italian theoretical physicist.

<i>The Order of Time</i> (film) 2023 film by Liliana Cavani

The Order of Time is a 2023 Belgian-Italian film directed by Liliana Cavani, from a screenplay written by Cavani and Paolo Costella in collaboration with physicist Carlo Rovelli. The film is freely inspired by Rovelli's 2017 essay of the same name. It stars an ensemble cast, which includes Alessandro Gassmann, Claudia Gerini, Edoardo Leo, Kseniya Rappoport, Richard Sammel, Valentina Cervi, Fabrizio Rongione, Francesca Inaudi, Angeliqa Devi and Ángela Molina.

References

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  2. ↑ "Facultypage". www.perimeterinstitute.ca.
  3. ↑ "Faculty". www.rotman.uwo.ca.
  4. ↑ "Fractal faculty". www.santafe.edu/people/profile/carlo-rovelli.
  5. ↑ Carlo Rovelli (25 July 2017). "Carlo Rovelli: 'I felt the beautiful adventure of physics was a story that had to be told'". The Guardian. Retrieved 5 April 2018.
  6. ↑ "2019 Global Thinkers". Foreign Policy. 12 January 2019.
  7. ↑ "The world's top 50 thinkers 2021". Prospect Magazine. 13 July 2021.
  8. ↑ Carlo Rovelli, "Fatti Nostri".
  9. ↑ "Fatti Nostri", Bertani editore, 1977, (re-edited Rimini, Nda Press, 2007), ISBN   978-88-89035-17-7
  10. ↑ "Send us your questions for Carlo Rovelli", The Guardian, 5-3-2019. Retrieved 1-6-2023.
  11. ↑ Higgins, Charlotte (14 April 2018). "'There is no such thing as past or future': physicist Carlo Rovelli on changing how we think about time". The Guardian. Retrieved 10 January 2022.
  12. ↑ Carlo Rovelli, "Cos'è il tempo? Cos'è lo spazio?".
  13. ↑ "Artista". archivio.festivaldelleletterature.it. Archived from the original on 21 May 2012. Retrieved 14 January 2022.
  14. ↑ 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.
  15. ↑ 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.
  16. ↑ 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.
  17. ↑ "Relational Quantum Mechanics" The Stanford Encyclopedia of Philosophy (Winter 2021 Edition).
  18. ↑ 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.
  19. ↑ 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.
  20. ↑ 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. Archived 2020-07-27 at the Wayback Machine
  21. ↑ "What scientific term or concept ought to be more widely known? - Relative Information", Edge.org, 2017. Retrieved 13-9-2019
  22. ↑ 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.
  23. ↑ Anaximandre de Millet, ou la naissance de la science, pg. 180.
  24. 1 2 Anaximandre de Millet, ou la naissance de la science, pg. 75.
  25. ↑ There Are Places in the World Where Rules Are Less Important Than Kindness, Penguin Random House, 2020
  26. 1 2 The First Scientist, pg. 153.
  27. ↑ Bologna, marzo 1977 ...fatti nostri..., Bertani, 1978
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  29. ↑ "Rovelli: «Al Primo Maggio ho detto quello che pensavo: non sono filorusso, ma questo governo fa scelte bellicose»", Corriere della Sera 23-5-2023, 2017. Retrieved 1-6-2023
  30. ↑ "Caso Rovelli, la retromarcia di Levi: il fisico sarà alla Fiera di Francoforte", Corriere della Sera, 23-3-2023.
  31. ↑ "Ricardo Franco Levi, lettera di dimissioni a Sangiuliano dopo il caso Rovelli e le polemiche sul figlio", Il Messaggero 26-5-2023, 2017. Retrieved 1-6-2023
  32. ↑ Rovelli, Carlo (26 October 2023). "The new global arms race will lead to catastrophe. The west can pursue it — or choose peace". The Guardian. London, United Kingdom. ISSN   0261-3077 . Retrieved 26 October 2023.
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  34. ↑ "Theoretical physicist Carlo Rovelli to receive 2024 Lewis Thomas Prize". www.rockefeller.edu.
  35. ↑ "Award list". ISGRG.
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  46. ↑ "Carlo Rovelli e l'incontro con la Cavani: «È la mia regista mito. A 17 anni vidi 'Il portiere di notte' e fu una fucilata»". Corriere della Sera . 25 August 2023. Retrieved 16 September 2024.
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External videos
Nuvola apps kaboodle.svg 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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