This thesis presents theoretical and numerical studies on phenomenological description of the quark-gluon plasma (QGP), a many-body system of elementary particles.

The author formulates a causal theory of hydrodynamics for systems with net charges from the law of increasing entropy and a momentum expansion method. The derived equation results can be applied not only to collider physics, but also to the early universe and ultra-cold atoms.

The author also develops novel off-equilibrium hydrodynamic models for the longitudinal expansion of the QGP on the basis of these equations. Numerical estimations show that convection and entropy production during the hydrodynamic evolution are key to explaining excessive charged particle production, recently observed at the Large Hadron Collider. Furthermore, the analyses at finite baryon density indicate that the energy available for QGP production is larger than the amount conventionally assumed.

Auteur
Dr.Akihiko Monnai RIKEN-BNL Research Center, Nishina Center, RIKEN 2-1 Hirosawa,Wako-shi, Saitama 351-0198, Japan Tel: +81-48-462-1226 (Ext. 3449).

Contenu
Introduction.- High-Energy Heavy Ion Collisions.- Relativistic Dissipative Hydrodynamics with Conserved Charges.- Viscous Hydrodynamic Model and the Color Glass Condensate.- Dissipative Hydrodynamic Model and Baryon Stopping.- Summary and Conclusion.- Appendices.