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    题名: Nonequilibrium phenomena in quantum field theory: From linear response to dynamical renormalization group
    作者: Wang, Shang-yung
    贡献者: 淡江大學物理學系
    关键词: High Energy Physics - Phenomenology (hep-ph);Condensed Matter (cond-mat);Nuclear Theory (nucl-th)
    日期: 2001-12
    上传时间: 2012-05-30 22:57:45 (UTC+8)
    出版者: University of Pittsburgh
    摘要: This thesis is devoted to studying aspects of real-time nonequilibrium dynamics in quantum field theory by implementing an initial value formulation of quantum field theory. The main focus is on the linear relaxation of mean fields and quantum kinetics in nonequilibrium multiparticle quantum systems with potential applications to ultrarelativistic heavy ion collisions, cosmological phase transitions and condensed matter systems. We first study the damping of fermion mean fields in a fermion-scalar plasma with a view towards understanding baryon transport phenomena during electroweak baryogenesis. Secondly, we apply and extend the renormalization group method to study nonequilibrium dynamics with the goals of constructing a quantum kinetic description that goes beyond usual Boltzmann kinetics and understanding anomalous relaxation associated with infrared phenomena. The final part of this thesis presents a real-time kinetic analysis of direct photon production from a quark-gluon plasma created in ultrarelativistic heavy ion collisions. We show that the direct photon yield is significantly enhanced by the lowest order energy-nonconserving processes originated in the transient lifetime of the quark-gluon plasma.
    显示于类别:[物理學系暨研究所] 學位論文


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