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arXiv 0904.1273gr-qcastro-ph.COhep-th
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低能态的宇宙粒子产生

Cosmological particle creation in states of low energy

Andreas Degner, Rainer Verch

摘要:

最近提出的低能态为宇宙学Friedmann-Robertson-Walker时空中的量子化线性标量场提供了一类很好的参考态。一个态的低能量性质是局域化的,接近宇宙学时间坐标的某个值。本文计算了早期低能态和晚期低能态之间的相对宇宙学粒子产生。在一个指数膨胀的宇宙中,我们发现粒子产生在空间频率模式中表现出振荡。用于计算相对颗粒产生的方法的基础是完全严格的。近似值仅用于数值计算级别。

英文摘要:

The recently proposed states of low energy provide a well-motivated class of reference states for the quantized linear scalar field on cosmological Friedmann-Robertson-Walker spacetimes. The low energy property of a state is localized close to some value of the cosmological time coordinate. We present calculations of the relative cosmological particle production between a state of low energy at early time and another such state at later time. In an exponentially expanding Universe, we find that the particle production shows oscillations in the spatial frequency modes. The basis of the method for calculating the relative particle production is completely rigorous. Approximations are only used at the level of numerical calculation.

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