Analytic approaches to relativistic nonequilibrium processes

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K17696
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kyoto University
• Principal Investigator: Hatta Yoshitaka 京都大学, 基礎物理学研究所, 准教授 (00512534)
• Research Collaborator: TSUTSUI Shoichiro ; BLAIZOT Jean-Paul ; Xiao Bo-Wen ; YANG Di-Lun
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 重イオン衝突の熱化 / 非平衡系の場の理論 / ボーズ凝縮

Outline of Final Research Achievements

In relativistic heavy-ion collisions, the high density gluonic matter produced after the collision evolves into a thermalized quark-gluon plasma. It has been suggested that, due to the high gluon occupancy in the initial state, a Bose-Einstein condensate (BEC) of gluons may be formed at an intermediate stage of the nonequilibrium evolution. We study the possibility of the BEC formation based on the 2PI (two-particle irreducible) formalism. We find that, while the system approaches the threshold of BEC formation, it is eventually avoided due to the number-changing inelastic processes. This is in contrast to the finding of previous studies based on the Boltzmann equation where inelastic processes are neglected and a BEC is formed.

Free Research Field

量子色力学