Kinetic transport theory with quantum coherence

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• 作者：Matti Herranen ; Kimmo Kainulainen ; Pyry M. Rahkila
• 关键词：Finite-temperature field theory ; Quantum transport
• 刊名：Nuclear Physics A
• 出版年：2009
• 出版时间：1 April 2009
• 年：2009
• 卷：820
• 期：1-4
• 页码：203c-206c
• 全文大小：306 K

文摘

We derive transport equations for fermions and bosons in spatially or temporally varying backgrounds with special symmetries, by use of the Schwinger-Keldysh formalism. In a noninteracting theory the coherence information is shown to be encoded in new singular shells for the 2-point function. Imposing this phase space structure to the interacting theory leads to a a self-consistent equation of motion for a physcial density matrix, including coherence and a well defined collision integral. The method is applied e.g. to demonstrate how an initially coherent out-of-equlibrium state approaches equlibrium through decoherence and thermalization.