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arXiv 0904.3073hep-phastro-ph.COhep-thnucl-th
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量子场论中的不稳定性诱导费米子产生

Instability-induced fermion production in quantum field theory

J. Berges, J. Pruschke, A. Rothkopf

摘要:

已知非平衡不稳定性会导致低动量模在比渐近热平衡时间短得多的时间尺度上玻色子占据数的指数放大。我们表明,汤川型相互作用,这种增长引起非常有效的费米子生产,这与最大的初级玻色子增长率进行。该描述是基于1/N扩展的2 PI有效的行动,包括玻色子费米子环,这是至关重要的观察这种现象的非线性光学。对于玻色子扇区中足够长的放大,当红外线达到热占有时,费米子的产生终止。在较高的动量下,玻色子占据数较低,费米子模呈现指数为2的幂律区域。

英文摘要:

Nonequilibrium instabilities are known to lead to exponential amplification of boson occupation numbers for low momentum modes on time scales much shorter than the asymptotic thermal equilibration time. We show for Yukawa-type interactions that this growth induces very efficient fermion production, which proceeds with the maximum primary boson growth rate. The description is based on a 1/N expansion of the 2PI effective action to NLO including boson-fermion loops, which are crucial to observe this phenomenon. For long enough amplification in the boson sector, fermion production terminates when the thermal occupancy is reached in the infrared. At higher momenta, where boson occupation numbers are low, the fermion modes exhibit a power-law regime with exponent two.

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