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Constantino Tsallis

Brazilian physicist of Greek descent

Constantino Tsallis
Constantino Tsallis in 2010.
Born	(1943-11-04) November 4, 1943 (age 80) Athens, Greece
Nationality	Greek
Citizenship	Brazilian
Education	Balseiro Institute Centro Brasileiro de Pesquisas Físicas University of Paris-Sud
Known for	Tsallis entropy and Tsallis statistics
Awards	Premio México de Ciencia y Tecnología (2003)
Scientific career
Fields	Theoretical physics
Institutions	Centro Brasileiro de Pesquisas Físicas (Brazilian Physics Research Center)
Doctoral advisor	Guido Beck André Guinier

Constantino Tsallis (/ˈsælɪs/; Greek: Κωνσταντίνος Τσάλλης [ˈtsalis]; born 4 November 1943) is a naturalized Brazilian physicistofGreek descent, working in Rio de JaneiroatCentro Brasileiro de Pesquisas Físicas (CBPF), Brazil.

Biography[edit]

Tsallis was born in Greece, and grew up in Argentina, where he studied physics at Instituto Balseiro, in Bariloche. In 1974, he received a Doctorat d'État ès Sciences Physiques degree from the University of Paris-Sud. He moved to Brazil in 1975 with his wife and daughter. Tsallis is an External Professor of the Santa Fe Institute.^[1]

Research[edit]

Tsallis is credited with introducing the notion of what is known as Tsallis entropy and Tsallis statistics in his 1988 paper『Possible generalization of Boltzmann–Gibbs statistics』published in the Journal of Statistical Physics.^[2] The generalization is considered to be a good candidate for formulating a theory of non-extensive thermodynamics. The resulting theory is not intended to replace Boltzmann–Gibbs statistics, but rather supplement it, such as in the case of anomalous systems characterised by non-ergodicityormetastable states.

One experimental verification of the predictions of Tsallis statistics concerned cold atoms in dissipative optical lattices. Eric Lutz made an analytical prediction in 2003 which was verified in 2006 by a London team.

Tsallis conjectured in 1999 (Brazilian Journal of Physics 29, 1;^[3] Figure 4):

1. That a longstanding quasi-stationary state (QSS) was expected in long-range interacting Hamiltonian systems (one of the core problems of statistical mechanics). This was verified by groups around the world.^[who?]
2. That this QSS should be described by Tsallis statistics instead of Boltzmann–Gibbs statistics. This was verified in June 2007 by Pluchino, Rapisarda and Tsallis (in the last figure, instead of the Maxwellian (Gaussian) distribution of velocities (valid for short-range interactions), one sees a q-Gaussian).

References[edit]

External links[edit]

• Homepage of Constantino Tsallis
• The regularly updated link to the literature of nonextensive statistics