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arXiv 0806.3158hep-phastro-ph
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膨胀背景中的量子场热化

Quantum field thermalization in expanding backgrounds

Anders Tranberg

摘要:

在扩展(Friedmann-Robertson-Walker)背景下建立了非平衡量子场的2 PI有效作用量形式.我们在耦合展开中写出并求解了φ ^4模型在非线性光学下的演化方程。我们对重整化、晶格离散化以及该方法的适用范围等问题进行了评论。一些例子计算,包括热化和(p)再加热。更复杂的系统和应用的推广进行了讨论。

英文摘要:

The 2PI effective action formalism for quantum fields out of equilibrium is set up in an expanding (Friedmann-Robertson-Walker) background. We write down and solve the evolution equations for a phi^4 model at NLO in a coupling expansion. We comment on issues of renormalization, lattice discretization and the range of applicability of the approach. A number of example calculations are presented, including thermalization and (p)reheating. Generalizations to more complicated systems and applications are discussed.

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