Louis de Broglie
Louis de Broglie  

Born 
Dieppe, France 
15 August 1892
Died 
19 March 1987 Louveciennes, France 
(aged 94)
Nationality  French 
Fields  Physics 
Institutions 
Sorbonne University of Paris 
Alma mater  Sorbonne 
Doctoral advisor  Paul Langevin 
Doctoral students 
Cécile DeWittMorette Bernard d'Espagnat JeanPierre Vigier Alexandru Proca 
Known for 
Wave nature of electrons De Broglie–Bohm theory de Broglie wavelength 
Notable awards 
Nobel Prize in Physics (1929) Kalinga Prize (1952) 
LouisVictorPierreRaymond, 7th duc de Broglie, (; French pronunciation: ,^{[1]}^{[2]} ( ); 15 August 1892 – 19 March 1987) was a French physicist who made groundbreaking contributions to quantum theory. In his 1924 PhD thesis he postulated the wave nature of electrons and suggested that all matter has wave properties.
A hitherto troubling wave–particle duality, arrives in 1905 with the Einstein's explanation of the photoelectric effect (by postulating the existence of photons). De Broglie conceived, in his thesis, a model where the duality vanishes, and extended this embryonic pilotwave model to material particles, conceiving the matter wave; this was later known as the "de Broglie hypothesis". He won the Nobel Prize for Physics in 1929, after the 1927's experimental confirmation of de Broglie hypothesis.
The 1925's pilotwave picture,^{[3]} and the wavelike behaviour of particles discovered by de Broglie was used by Erwin Schrödinger in his formulation of wave mechanics.^{[4]} The pilotwave model and interpretation was then abandoned, in favor of the quantum formalism, until 1952 when it was rediscovered and enhanced by David Bohm.
Louis de Broglie was the sixteenth member elected to occupy seat 1 of the Académie française in 1944, and served as Perpetual Secretary of the French Academy of Sciences.^{[5]}^{[6]}
Contents
Biography
Louis de Broglie was born to a noble family in Dieppe, SeineMaritime, younger son of Victor, 5th duc de Broglie. He became the 7th duc de Broglie upon the death without heir in 1960 of his older brother, Maurice, 6th duc de Broglie, also a physicist. He did not marry. When he died in Louveciennes, he was succeeded as duke by a distant cousin, VictorFrançois, 8th duc de Broglie.
De Broglie and his colleagues had intended a career in humanities, and received his first degree in history. Afterwards, though, he turned his attention toward mathematics and physics and received a degree in physics. With the outbreak of the First World War in 1914, he offered his services to the army in the development of radio communications.
His 1924 Recherches sur la théorie des quanta (Research on the Theory of the Quanta), introduced his theory of electron waves. This included the wave–particle duality theory of matter, based on the work of Max Planck and Albert Einstein on light. The thesis examiners, unsure of the material, passed his thesis to Einstein for evaluation who endorsed his wave–particle duality proposal wholeheartedly; de Broglie was awarded his doctorate. This research culminated in the de Broglie hypothesis stating that any moving particle or object had an associated wave. De Broglie thus created a new field in physics, the mécanique ondulatoire, or wave mechanics, uniting the physics of energy (wave) and matter (particle). For this he won the Nobel Prize in Physics in 1929.
In his later career, de Broglie worked to develop a causal explanation of wave mechanics, in opposition to the wholly probabilistic models which dominate quantum mechanical theory; it was refined by David Bohm in the 1950s. The theory has since been known as the De Broglie–Bohm theory.
In addition to strictly scientific work, de Broglie thought and wrote about the philosophy of science, including the value of modern scientific discoveries.
De Broglie became a member of the Académie des sciences in 1933, and was the academy's perpetual secretary from 1942. He was asked to join Le Conseil de l'Union Catholique des Scientifiques Francais; however, he declined. This was due to the fact that he was nonreligious.^{[7]}
On 12 October 1944, he was elected to the Académie française, replacing mathematician Émile Picard. Because of the deaths and imprisonments of Académie members during the occupation and other effects of the war, the Académie was unable to meet the quorum of twenty members for his election; due to the exceptional circumstances, however, his unanimous election by the seventeen members present was accepted. In an event unique in the history of the Académie, he was received as a member by his own brother Maurice, who had been elected in 1934. UNESCO awarded him the first Kalinga Prize in 1952 for his work in popularizing scientific knowledge, and he was elected a Foreign Member of the Royal Society on 23 April 1953.^{[8]}
In 1961 he received the title of Knight of the Grand Cross in the Légion d'honneur. De Broglie was awarded a post as counselor to the French High Commission of Atomic Energy in 1945 for his efforts to bring industry and science closer together. He established a center for applied mechanics at the Henri Poincaré Institute, where research into optics, cybernetics, and atomic energy were carried out. He inspired the formation of the International Academy of Quantum Molecular Science and was an early member.
Important theories
Matter and wave–particle duality
"The fundamental idea of [my 1924 thesis] was the following: The fact that, following Einstein's introduction of photons in light waves, one knew that light contains particles which are concentrations of energy incorporated into the wave, suggests that all particles, like the electron, must be transported by a wave into which it is incorporated... My essential idea was to extend to all particles the coexistence of waves and particles discovered by Einstein in 1905 in the case of light and photons." "With every particle of matter with mass m and velocity v a real wave must be 'associated'", related to the momentum by the equation:
 \lambda = \frac{h}{p} = \frac {h} \sqrt{1  \frac{v^2}{c^2}}
where \lambda is the wavelength, h is the Planck constant, p is the momentum, m is the rest mass, v is the velocity and c is the speed of light in a vacuum."
This theory set the basis of wave mechanics. It was supported by Einstein, confirmed by the electron diffraction experiments of Davisson and Germer, and generalized by the work of Schrödinger.
However, this generalization was statistical and was not approved of by de Broglie, who said "that the particle must be the seat of an internal periodic movement and that it must move in a wave in order to remain in phase with it was ignored by the actual physicists [who are] wrong to consider a wave propagation without localization of the particle, which was quite contrary to my original ideas."
From a philosophical viewpoint, this theory of matterwaves has contributed greatly to the ruin of the atomism of the past. Originally, de Broglie thought that real wave (i.e., having a direct physical interpretation) was associated with particles. In fact, the wave aspect of matter was formalized by a wavefunction defined by the Schrödinger equation, which is a pure mathematical entity having a probabilistic interpretation, without the support of real physical elements. This wavefunction gives an appearance of wave behavior to matter, without making real physical waves appear. However, until the end of his life de Broglie returned to a direct and real physical interpretation of matterwaves, following the work of David Bohm. The de Broglie–Bohm theory is today the only interpretation giving real status to matterwaves and representing the predictions of quantum theory.
Conjecture of an internal clock of the electron
In his 1924 thesis, de Broglie conjectured that the electron has an internal clock that constitutes part of the mechanism by which a pilot wave guides a particle.^{[9]} Subsequently David Hestenes has proposed a link to the Zitterbewegung that was suggested by Erwin Schrödinger.^{[10]}
Attempts at verifying the internal clock hypothesis and measuring clock frequency are so far not conclusive;^{[11]} recent experimental data is at least compatible with de Broglie's conjecture.^{[12]}
Nonnullity and variability of mass
According to de Broglie, the neutrino and the photon have rest masses that are nonzero, though very low. That a photon is not quite massless is imposed by the coherence of his theory. Incidentally, this rejection of the hypothesis of a massless photon enabled him to doubt the hypothesis of the expansion of the universe.
In addition, he believed that the true mass of particles is not constant, but variable, and that each particle can be represented as a thermodynamic machine equivalent to a cyclic integral of action.
Generalization of the principle of least action
In the second part of his 1924 thesis, de Broglie used the equivalence of the mechanical principle of least action with Fermat's optical principle: "Fermat's principle applied to phase waves is identical to Maupertuis' principle applied to the moving body; the possible dynamic trajectories of the moving body are identical to the possible rays of the wave." This equivalence had been pointed out by Hamilton a century earlier, and published by him around 1830, in an era where no experience gave proof of the fundamental principles of physics being involved in the description of atomic phenomena.
Up to his final work, he appeared to be the physicist who most sought that dimension of action which Max Planck, at the beginning of the 20th century, had shown to be the only universal unity (with his dimension of entropy).
Duality of the laws of nature
Far from claiming to make "the contradiction disappear" which Max Born thought could be achieved with a statistical approach, de Broglie extended wave–particle duality to all particles (and to crystals which revealed the effects of diffraction) and extended the principle of duality to the laws of nature.
His last work made a single system of laws from the two large systems of thermodynamics and of mechanics:
That idea seems to match the continuous–discontinuous duality, since its dynamics could be the limit of its thermodynamics when transitions to continuous limits are postulated. It is also close to that of Leibniz, who posited the necessity of "architectonic principles" to complete the system of mechanical laws.
However, according to him, there is less duality, in the sense of opposition, than synthesis (one is the limit of the other) and the effort of synthesis is constant according to him, like in his first formula, in which the first member pertains to mechanics and the second to optics:
 m c^2 = h \nu
Neutrino theory of light
This theory, which dates from 1934, introduces the idea that the photon is equivalent to the fusion of two Dirac neutrinos.
It shows that the movement of the center of gravity of these two particles obeys the Maxwell equations—that implies that the neutrino and the photon both have rest masses that are nonzero, though very low.
Hidden thermodynamics
De Broglie's final idea was the hidden thermodynamics of isolated particles. It is an attempt to bring together the three furthest principles of physics: the principles of Fermat, Maupertuis, and Carnot.
In this work, action becomes a sort of opposite to entropy, through an equation that relates the only two universal dimensions of the form:
 {\text{action}\over h} = {\text{entropy}\over k}
As a consequence of its great impact, this theory brings back the uncertainty principle to distances around extrema of action, distances corresponding to reductions in entropy.
Honors and awards
 1929 Nobel Prize in Physics
 1929 Henri Poincaré Medal
 1932 Albert I of Monaco Prize
 1938 Max Planck Medal
 1938 Fellow, Royal Swedish Academy of Sciences
 1944 Fellow, Académie française
 1952 Kalinga Prize
 1953 Fellow, Royal Society^{[8]}
Publications
 Recherches sur la théorie des quanta (Researches on the quantum theory), Thesis, Paris, 1924, Ann. de Physique (10) 3, 22 (1925)
 Ondes et mouvements (Waves and Motions). Paris: GauthierVillars, 1926.
 Rapport au 5e Conseil de Physique Solvay. Brussels, 1927.
 La mécanique ondulatoire (Wave Mechanics). Paris: GauthierVillars, 1928.
 Matière et lumière (Matter and Light). Paris: Albin Michel, 1937.

Une tentative d'interprétation causale et non linéaire de la mécanique ondulatoire: la théorie de la double solution. Paris: GauthierVillars, 1956.
 English translation: Nonlinear Wave Mechanics: A Causal Interpretation. Amsterdam: Elsevier, 1960.
 Sur les sentiers de la science (On the Paths of Science).

Introduction à la nouvelle théorie des particules de M. JeanPierre Vigier et de ses collaborateurs. Paris: GauthierVillars, 1961. Paris: Albin Michel, 1960.
 English translation: Introduction to the Vigier Theory of elementary particles. Amsterdam: Elsevier, 1963.

Étude critique des bases de l'interprétation actuelle de la mécanique ondulatoire. Paris: GauthierVillars, 1963.
 English translation: The Current Interpretation of Wave Mechanics: A Critical Study. Amsterdam, Elsevier, 1964.
 Certitudes et incertitudes de la science (Certitudes and Incertitudes of Science). Paris: Albin Michel, 1966.
References
 ^ Léon Warnant (1987). Dictionnaire de la prononciation française dans sa norme actuelle (in French) (3rd ed.). Gembloux: J. Duculot, S. A.
 ^ JeanMarie Pierret (1994). Phonétique historique du français et notions de phonétique générale (in French). LouvainlaNeuve: Peeters. p. 102.
 ^ The final pilotwave model was presented in Solvay Conferences and later published, in "Ondes et mouvements" of 1926.
 ^ Antony Valentini: On the PilotWave Theory of Classical, Quantum and Subquantum Physics, Ph.D. Thesis, ISAS, Trieste 1992
 ^ .
 ^ "History of International Academy of Quantum Molecular Science". IAQMS. Retrieved 20100308.
 ^ Evans, James; Thorndike, Alan S. (2007). Quantum Mechanics at the Crossroads: New Perspectives From History, Philosophy And Physics. Springer. p. 71.
 ^ ^{}a ^{b}
 ^ See for example the description of de Broglie's view in: David Bohm, Basil Hiley: The de Broglie pilot wave theory and the further development and new insights arising out of it, Foundations of Physics, volume 12, number 10, 1982, Appendix: On the background of the papers on trajectories interpretation, by D. Bohm, (PDF)
 ^ D. Hestenes, October 1990, The Zitterbewegung interpretation of quantum mechanics, Foundations of Physics, vol. 20, no. 10, pp. 1213–1232
 ^ See for example G.R. Osche, Electron channeling resonance and de Broglie's internal clock, Annales de la Fondation Louis de Broglie, vol. 36, 2001, pp. 61–71 (full text)
 ^ Catillon, Foundations of Physics, July 2001, vol. 38, no. 7, pp. 659–664
External links
 Les Immortels: Louis de BROGLIE" (Académie française, in French)
 Louis de Broglie – Biography" (Nobel Foundation)
 Paul Theroff (2005) An Online Gotha: Broglie Genealogy
 Fondation Louis de Broglie
 Louis de Broglie at the Mathematics Genealogy Project
 English translation of his book on hidden thermodynamics by D. H. Delphenich
 The Theory of measurement in wave mechanics (English translation of his book on the subject)
 "A new conception of light" (English translation)



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 1892 births
 1987 deaths
 People from Dieppe, SeineMaritime
 Dukes of Broglie
 University of Paris alumni
 Foreign Members of the Royal Society
 French physicists
 International Academy of Quantum Molecular Science members
 Kalinga Prize recipients
 University of Paris faculty
 Members of the Académie française
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 Members of the Royal Swedish Academy of Sciences
 Foreign Members of the USSR Academy of Sciences
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