Jun 15, GianCarlo Ghirardi, former professor of theoretical physics and then emeritus at the physics department of our university, passed away on 1st. GianCarlo Ghirardi. Angelo Bassi and Tullio Weber. University of Trieste, Trieste, Italy. Detlef Dürr. Ludwig-Maximilians University, Munich, Germany. PDF Full. Jun 4, The ICTP community is mourning the sudden passing of long-time colleague GianCarlo Ghirardi. Professor Ghirardi was associated with ICTP.

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Although GRW make the wave function collapse, and their mathematics is “precise,” they still can not predict exactly when the collapse occurs. All historical experience confirms that men might not achieve the possible if they had not, time and time again, reached out for the impossible.

Kastner Ghirard Kauffman Martin J. The Landau—Lifshitz approach can be seen as maintaining this simple non-dual kinematics, but with the wavefunction compact on a macroscopic rather than microscopic scale.

In Memoriam

But however far the wavefunction has extended, the reaction of a detector to an electron remains spotty. As discussed in Section Retrieved from ” https: The reader needs to be warned that the problem cannot be avoided, and that it inevitably involves macroscopic systems. But that was wrong.

The foregoing arguments might seem to point toward the number of particles as a possible candidate, but that does not work: And this represents in a certain sense although many ambiguities remain the orthodox position: Citation for this page in APA citation style. The relevant physical implications of the enormous complexity of the apparatus will emerge when we pose the problem of how to “verify in the laboratory” that in fact, at the end, there is a superposition of macroscopically distinguishable states.

Jonathan Lowe John R. Ghirardi was a member of the editorial board of Foundations of Physics [9] and formerly of Studies in History and Philosophy of Modern Science.

Giancarlo Ghirardi

The reader may recall the escape strategy Bohr used to defend his position against Einstein’s observations that a precise measurement of the state of a macroscopic object see Figures 7. The X s are somehow macroscopic.


He independently rederived, in a referee report to Foundations of Tiancarlo, the no-cloning theorem [4]before the works by Wootters and Zurek [5] and by Dieks [6] inbut after the actual first derivation by Park [7] in When we speak of a precise boundary, nobody is pretending that there exists some perfectly defined criterion of demarcation that allows us to say that up to here quantum mechanics is valid; from this point on, the reduction of the wave packet takes over.

Winter college on nuclear physics and reactors: It is important to emphasize the radical differences in the description of the measuring process when we use the evolution equation of the theory or when we resort to the postulate of the reduction of the wave packet. The President of ghirarddi Province of TriesteMaria Teresa Bassa Poropatconferred the Sigillo della Provincia di Trieste to Giancarlo Ghirardi for research and teaching, for his commitment to the promotion and development of physics in Trieste and for his intense and fruitful activity as the author of popular books and scientific publications.

[] My life with GianCarlo Ghirardi, a great friend, a great teacher and a great physicist

The theory aimed to reconcile the paradoxical behaviour of quantum mechanics in the subatomic world with the more predictable behaviour of particles in the macroscopic world that we all experience.

Let us consider Newtonian mechanics and the theory of relativity.

The orthodox approaches, whether the authors think they have made derivations or assumptions, are just fine FAPP — when used with the good taste and discretion picked up from exposure to good examples. Giancarlo Ghirardi 28 October — 1 June was an Italian physicist and emeritus professor of theoretical physics at the University of Trieste. Bell had criticized the work of John von Neumannwho could not locate the boundary between the quantum system and the classical measuring apparatus.

So there must be some kind of ‘collapse’ going on in addition, to enforce macroscopic narrowness. It is simply random, with the probability very high in the presence of macroscopic objects.


Giancarll have indicated that if Einstein had insisted on his requirement of attributing definite properties up to an appropriate point of what we can call the von Neumann chain he would have constrained Bohr to accept that the entire universe requires a quantum treatment. Indeed, for every process of measurement that interests us, at giancarl certain level there must certainly intervene some observer whose perceptions are definite.

The “moment” at which the boundary between quantum and classical worlds occurs is the moment that irreversible observable information enters the universe. In fact, owing to the huge difference of scale between human beings and the microscopic systems we want to study, any attempt to obtain information about them requires a process of amplification that strictly correlates the microscopic properties to situations that are macroscopically perceivable and hence distinguishable to our perception.

He was one of the founders and first president of the Italian Society for the Foundations of Physics and authored a book on quantum mechanics, Un’occhiata alle carte di Dio, published in by Il Saggiatore in Milan, which has sold some 20, copies and later was translated by Princeton University Press under the title, Sneaking a Look at God’s Cards.

We then can ask ourselves: But even the brain is a physical system constituted of protons, neutrons, and electrons, and traversed by electrochemical reactions and the rest—processes that we have no biancarlo to think are not governed by our formalism. Ghirardi—Rimini—Weber theory Quantum mechanics foundations.

The de Broglie—Bohm-type theories retain, exactly, the linear wave equation, and so necessarily add complementary variables to express the non-waviness of the world on the macroscopic scale. But what, in Bohr’s view, would ghidardi the diaphragm or the pointer different from other systems used to determine the states of these objects—that is the real mystery.