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Self-consistency principle in high energy Physics : ウィキペディア英語版
Self-consistency principle in high energy Physics
The self-consistency principle was established by Rolf Hagedorn in 1965 to explain the thermodynamics of fireballs in high energy physics collisions. A thermodynamical approach to the high energy collisions first proposed by E. Fermi.〔E. Fermi. Prog. Theor. Phys. 5 (1950) 570.〕
==Partition function==
The partition function of the fireballs can be written in two forms, one in terms of its density of states, \sigma(E), and the other in terms of its mass spectrum, \rho(m).
The self-consistency principle says that both forms must be asymptotically equivalent for energies or masses sufficiently high (asymptotic limit). Also, the density of states and the mass spectrum must be asymptotically equivalent in the sense of the weak constraint proposed by Hagedorn〔R. Hagedorn, Suppl. Al Nuovo Cimento 3 (1965) 147.〕 as
: log()= log() .
These two conditions are known as the ''self-consistency principle'' or ''bootstrap-idea''. After a long mathematical analysis Hagedorn was able to prove that there is in fact \textstyle \rho(m) and \textstyle \sigma(E) satisfying the above conditions, resulting in
: \rho(m) = a m^ exp(\beta_o m)
and
: \sigma(E) = b E^ exp(\beta_o E)
with \textstyle a and \textstyle \alpha related by
:\alpha=\frac\bigg)^-1
where a singularity is clearly observed for \beta\beta_o. This singularity determines the limiting temperature \textstyle T_o=1/\beta _o in Hagedorn's theory, which is also known as Hagedorn temperature.
Hagedorn was able not only to give a simple explanation for the thermodynamical aspect of high energy particle production, but also worked out a formula for the hadronic mass spectrum and predicted the limiting temperature for hot hadronic systems.
After some time this limiting temperature was shown by N. Cabibbo and G. Parisi to be related to a phase transition,〔N. Cabibbo and G. Parisi, Phys. Lett. 59B (1975) 67.〕 which characterizes by the deconfinement of quarks at high energies. The mass spectrum was further analyzed by Steven Frautschi.〔S. Frautschi, Phys. Rev. D 11 (1971) 2821.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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