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arXiv 0803.0321astro-phhep-th
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氮膨胀后预热

Preheating after N-flation

Diana Battefeld, Shinsuke Kawai

摘要:

我们研究了N-flation中的预热,假设Marčenko-Pastur质量分布,在暴胀开始时的等能量初始条件和相等的轴子-物质耦合,其中物质被认为是一个单一的,无质量的玻色子场。通过数值分析,我们发现通过参数共振的预热被抑制,表明微扰预热的旧理论是适用的。虽然张量标量比,非高斯参数和标量谱指数计算N-膨胀是类似的单场膨胀(至少在一个观测可行的参数区域),我们的研究结果表明,预热的物理可以显着不同的单场的情况。

英文摘要:

We study preheating in N-flation, assuming the Marčenko-Pastur mass distribution, equal energy initial conditions at the beginning of inflation and equal axion-matter couplings, where matter is taken to be a single, massless bosonic field. By numerical analysis we find that preheating via parametric resonance is suppressed, indicating that the old theory of perturbative preheating is applicable. While the tensor-to-scalar ratio, the non-Gaussianity parameters and the scalar spectral index computed for N-flation are similar to those in single field inflation (at least within an observationally viable parameter region), our results suggest that the physics of preheating can differ significantly from the single field case.

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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