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Abstract: Nonequilibrium instabilities are known to lead to exponential amplificationof boson occupation numbers for low momentum modes on time scales much shorterthan the asymptotic thermal equilibration time. We show for Yukawa-typeinteractions that this growth induces very efficient fermion production, whichproceeds with the maximum primary boson growth rate. The description is basedon a 1-N expansion of the 2PI effective action to NLO including boson-fermionloops, which are crucial to observe this phenomenon. For long enoughamplification in the boson sector, fermion production terminates when thethermal occupancy is reached in the infrared. At higher momenta, where bosonoccupation numbers are low, the fermion modes exhibit a power-law regime withexponent two.



Autor: J. Berges, J. Pruschke, A. Rothkopf

Fuente: https://arxiv.org/







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