Roger Balian
Roger Balian ( born January 18, 1933, Lyon ) is a French theoretical physicist with Armenian roots.
Balian studied from 1952 in Paris at the École polytechnique. From 1955 to 1958 he was Ingénieurs des mines (→ Mines ParisTech ). From 1956 he was in the department of theoretical physics at the nuclear research center of the Commissariat à l' énergie Atomique (CEA ) in Saclay, where he in 1979 the head of the department of theoretical physics took over and remained until 1987. From 1972 he was a lecturer and in 1978 professor of physics at the École Polytechnique, where he retired in 1998.
Balian has been a visiting professor at Yale University and the University of California, Santa Barbara.
He is known for his contributions to quantum mechanical many-body theory and statistical physics ( phase transitions, role of information ), but also dealt with the foundations of quantum mechanics, nuclear physics, lattice gauge theories ( with Claude Itzykson ), quantum chaos and semiclassical methods and other fields of theoretical physics to distribution of galaxies. In the many-body theory in the 1960s, he worked a lot with Claude Bloch and Cyrano de Dominicis.
In 1952, he predicted the existence of a phase B at superfluid helium-3 isotope advance.
He was from 1972 to 1980 Director of Theoretical Physics at the Ecole de Physique des Houches. In 1988 he was co-editor and publisher of the 1992-1995 Euro Physics Letters from 1970 to 1975 and co-editor of Journal of Physics A.
Balian is a member of the Académie des sciences, since 1977., As a corresponding and since 1995 as a full member He is also a member of the Royal Society of Sciences of Uppsala and the Armenian Academy of Sciences. He is the scientific advisor of the Commissariat à l' énergie Atomique (CEA ). 1995-2007 he was the Scientific Advisory Board of the CEA (and also in the advisory board for military applications). 1997/98 he was president of the French Physical Society ( Société française de physique ).
In 1954 he received the Prix Henri Poincaré, also in 1954 the Prix Laplacian of the Académie des sciences in 1977 the Prix Jean Ricard and 1966 the Prix Paul Langevin of the French Physical Society.
He is Commander of the Ordre des Palmes Académiques, Knight of the Legion of Honour and Officer of the Ordre national du Mérite.
He was from 1976 to 1982 in the National Committee of the Centre national de la recherche scientifique (CNRS ), 1988 to 1993 its Scientific Council, 1992-1995 President of the subdivision of physics.
Writings
- From Micro to Macro Physics Physics: Methods and Applications of Statistical Physics, Springer Verlag 1991, 2006 ( first in French in 1982 )
- With other Demain, La Physique, Odile Jacob, 2004
- With Jean -Michel Drouffe, Claude Itzykson Gauge fields on a lattice, Physical Review D, Volume 10, 1974, p 3376-3395, Volume 11, 1975, p 2098-2119
- With Claude Bloch Solution of the Schrödinger equation in terms of classical paths, Annals of Physics, Volume 85, 1974, pp. 514-545
- Giorgio Parisi, André Voros Discrepancies from asymptotic series and Their relations to complex classical trajectories, Physical Review Letters, Volume 41, 1978, p 1141-1145
- Information in Statistical Physics, Studies in History and Philosophy of Modern Physics, Volume 36, 2005, pp. 323-353
- Un principe d' incertitude continued s theory you signal ou en mecanique quantique, Comptes Rendus Acad. Sci., Volume 292, 1981, pp. 1357-1362
- With NR value Hamer Superconductivity with pairs in a relative p- wave, Physical Review, Volume 131, 1963, pp. 1553-1564