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arXiv 1609.01124math-phhep-thmath.MP
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微扰代数量子场论中KMS态的稳定性

On the stability of KMS states in perturbative algebraic quantum field theories

Nicolo Drago, Federico Faldino, Nicola Pinamonti

摘要:

我们分析了在闵可夫斯基时空中传播的相互作用的大质量标量场的KMS态的稳定性,最近由Fredenmark和Lindner \cite{FredenhagenLindner}在微扰代数量子场论的框架内构建。特别是,我们证明了返回到平衡属性时的相互作用拉格朗日有紧空间支持的有效性。令人惊讶的是,这不再成立,如果考虑绝热极限,即当相互作用拉格朗日量在空间平移下不变时。因此,对于由自由动力学演化的微扰相互作用理论,绝热极限下的平衡态不再收敛于自由平衡态。实际上,我们证明了它的遍历平均收敛到自由理论的非平衡定态。

英文摘要:

We analyze the stability properties shown by KMS states for interacting massive scalar fields propagating over Minkowski spacetime, recently constructed in the framework of perturbative algebraic quantum field theories by Fredenhagen and Lindner \cite{FredenhagenLindner}. In particular, we prove the validity of the return to equilibrium property when the interaction Lagrangian has compact spatial support. Surprisingly, this does not hold anymore, if the adiabatic limit is considered, namely when the interaction Lagrangian is invariant under spatial translations. Consequently, an equilibrium state under the adiabatic limit for a perturbative interacting theory evolved with the free dynamics does not converge anymore to the free equilibrium state. Actually, we show that its ergodic mean converges to a non equilibrium steady state for the free theory.

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