655 research outputs found
The imprints of nonextensive statistical mechanics in high energy collisions
To describe high energy collisions one widely uses thermodynamical methods
and concepts which follow the classical Boltzmann-Gibbs (BG) approach. In many
cases, however, either some deviations from the expected behaviour are observed
experimentally or it is known that the conditions necessary for BG to apply are
satisfied only approximately. In other branches of physics where such
situations are ubiquitous, the popular remedy is to resort, instead, to the so
called nonextensive statistics, the most popular example of which is Tsallis
statistics. We shall provide here an overview of possible imprints of
non-extensitivity existing both in high energy cosmic ray physics and in
multiparticle production processes in hadronic collisions, in particular in
heavy ion collisions. Some novel proposition for the interpretation of the
nonextensitivity parameter q present in such circumstances will be discussed in
more detail.Comment: Invited talk presented by G.Wilk at International Workshop on
Classical and Quantum Complexity and Non-extensive Thermodynamics (Complexity
2000), Denton, University of North Texas, April 3-6, 2000. LaTeX file and 5
PS figures, 23 pages altogether. Some misprints corrected and references
updated. Revised version to be published in Chaos, Solitons and Fractals
(2001
Imprints of Nonextensivity in Multiparticle Production
The statistical methods based on the classical Boltzmann-Gibbs (BG) approach
are at heart of essentially all descriptions of multiparticle production
processes. In many cases, however, one observes some deviations from the
expected behaviour. It is also known that conditions necessary for the BG
statistics to apply are usually satisfied only approximately. Two attitudes are
possible in such situations: either to abandon statistical approach trying some
other model or to generalise it to the so called nonextensive statistics
(widely used in the similar circumstances in many other branches of physics).
We shall provide here an overview of possible imprints of non-extensitivity
existing both in high energy cosmic ray physics and in multiparticle production
processes in hadronic collisions, in particular in heavy ion collisions.Comment: LaTeX, 2 PS files with figures, 14 pages altogether. Invited talk
presented by G.Wilk at 6th International Workshop on Relativistic Aspects of
Nuclear Physics (RANP2000), Caraguatatuba, Tabatinga Beach, Sao Paulo,
Brazil, October 17-20, 2000. To be published in the proceedings (World
Scientific, Singapore). Minor changes, references update
Power-like abundance of elements in Universe
The apparently observed power-like abundance of elements in Universe is
discussed in more detail with special emphasis put on the strangelets.Comment: Presented at XXXII International Symposium on Multiparticle Dynamics,
Alushta, Crimea, Ukraine, September 7-13, 2002. To be published by World
Scientific (2003) (style file ws-procs9x6.cls attached). Some misprints
correcte
- …