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arXiv 1002.0167quant-phcond-mat.stat-mechhep-th
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相互作用场论中的量子猝灭:自洽近似

Quantum quench in interacting field theory: a self-consistent approximation

Spyros Sotiriadis, John Cardy

摘要:

我们利用自洽近似研究了相互作用的B^4模型中能隙和相互作用的复合量子猝灭。首先,我们回顾了自由理论的结果,其中量子淬火的能隙或质量导致长时间的静态行为与热特性。这一规则的一个例外是淬火后质量为零的2d情况。然而,在复合淬火中,我们发现在我们的近似中相互作用的效果只是有效地改变质量的值。这意味着,一方面,相互作用模型也表现出相同的定态行为,另一方面,这是真实的,即使是无质量的二维情况。

英文摘要:

We study a composite quantum quench of the energy gap and the interactions in the interacting ϕ^4 model using a self-consistent approximation. Firstly we review the results for free theories where a quantum quench of the energy gap or mass leads for long times to stationary behaviour with thermal characteristics. An exception to this rule is the 2d case with zero mass after the quench. In the composite quench however we find that the effect of the interactions in our approximation is simply to effectively change the value of the mass. This means on the one hand that the interacting model also exhibits the same stationary behaviour and on the other hand that this is now true even for the massless 2d case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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