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arXiv 0804.0163astro-ph
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暴胀过程中的耗散机制与观测一致吗?

Is a Dissipative Regime During Inflation in Agreement with Observations?

A. Cerioni, F. Finelli, A. Gruppuso

摘要:

研究了驱动标量场通过摩擦项$Γ$耦合到相对论流体的暴胀模型的曲率扰动谱指数。我们发现,只有一个非常小的摩擦项- $Γ\ll H$,与H是哈勃参数在通货膨胀-是允许的观测,否则曲率波动产生的光谱指数$n_s$不可接受的红色。这些结果对于暴胀势和已知的摩擦项对标量场和相对论流体的能量密度的依赖性是通用的。我们将我们的研究结果与以前的调查进行了比较。

英文摘要:

We study the spectral index of curvature perturbations for inflationary models where the driving scalar field is coupled to a relativistic fluid through a friction term $Γ$. We find that only a very small friction term - $Γ\ll H$, with H being the Hubble parameter during inflation - is allowed by observations, otherwise curvature fluctuations are generated with a spectral index $n_s$ unacceptably red. These results are generic with respect to the inflationary potential and known dependence of the friction term on the scalar field and the energy density of the relativistic fluid. We compare our findings with previous investigations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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