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arXiv 0704.0456gr-qc
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宇宙学背景中的粒子传播

Particle propagation in cosmological backgrounds

Daniel Arteaga

摘要:

我们研究了宇宙学背景中粒子的量子传播,通过考虑在膨胀的宇宙中传播的大质量标量场的双重态,可能充满辐射。我们专注于与膨胀率相关的耗散效应。在一阶,我们恢复预期的结果,衰变率是由当地的温度。除了线性序,衰变率还有一个由膨胀参数决定的额外贡献。即使对于真空中的稳定粒子,也存在后一种贡献。最后,我们分析了传播子的长时间行为,并简要讨论了trans-Planckian问题的应用。

英文摘要:

We study the quantum propagation of particles in cosmological backgrounds, by considering a doublet of massive scalar fields propagating in an expanding universe, possibly filled with radiation. We focus on the dissipative effects related to the expansion rate. At first order, we recover the expected result that the decay rate is determined by the local temperature. Beyond linear order, the decay rate has an additional contribution governed by the expansion parameter. This latter contribution is present even for stable particles in the vacuum. Finally, we analyze the long time behaviour of the propagator and briefly discuss applications to the trans-Planckian question.

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