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arXiv 0707.2299gr-qcastro-phhep-th
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具有通量不稳定的约束相互作用暗能量模型

Constraining interacting dark energy models with flux destabilization

Raul Horvat, Diego Pavon

摘要:

利用Landau-Lifshitz涨落流体动力学理论,分析了与暗能量问题有关的两个真空衰变定律中,从真空到辐射的转移能流的不稳定性.假设在宇宙膨胀的最早时期真空和辐射之间的热(或近热)平衡,我们表明,由于重整化群运行的宇宙学常数项的法律,与参数选择不破坏原始核合成的情况下,很快驱动流量波动超过其统计平均值,从而扭曲宇宙背景辐射谱超出观测极限。虽然来自饱和全息暗能量的定律不会导致通量剧烈波动,但更现实的非饱和形式再次显示了这种反常行为。

英文摘要:

A destabilization in the transfer energy flux from the vacuum to radiation, for two vacuum decay laws relevant to the dark energy problem, is analyzed using the Landau-Lifshitz fluctuation hydrodynamic theory. Assuming thermal (or near thermal) equilibrium between the vacuum and radiation, at the earliest epoch of the Universe expansion, we show that the law due to renormalization-group running of the cosmological constant term, with parameters chosen not to spoil the primordial nucleosynthesis scenario, does soon drive the flux to fluctuate beyond its statistical average value thereby distorting the cosmic background radiation spectrum beyond observational limits. While the law coming from the saturated holographic dark energy does not lead the flux to wildly fluctuate, a more realistic non--saturated form shows again such anomalous behavior.

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