On the generation of a non-gaussian curvature perturbation during preheating
On the generation of a non-gaussian curvature perturbation during preheating
复制标题
预热过程中非高斯曲率扰动的产生
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
César A. Valenzuela
中科院分区：
文献类型：
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作者：
K. Kohri;D. Lyth;César A. Valenzuela
光场的微扰可能会影响预热，从而对曲率微扰ζ的光谱和非高斯性产生贡献。场可以直接出现在预热模型中(曲率型预热)，也可以通过其对质量或耦合的影响间接出现(调制预热)。基于ζN公式，给出了δ的一般表达式，并将其应用于二次和四次混沌膨胀的情形。对于二次型预热，曲率型预热对ζ的贡献是无效的，但调制预热可以有效。对于四次膨胀，曲率型预热可能是有效的，但通常的δN公式必须修正。我们看看在什么情况下，最近邦德等人的数值模拟。[0903.3407]可能足以提供本案的粗略估计。
The perturbation of a light field might affect preheating and hence generate a contribution to the spectrum and non-gaussianity of the curvature perturbation ζ. The field might appear directly in the preheating model (curvaton-type preheating) or indirectly through its effect on a mass or coupling (modulated preheating). We give general expressions for ζ based on the δN formula, and apply them to the cases of quadratic and quartic chaotic inflation. For the quadratic case, curvaton-type preheating is ineffective in contributing to ζ, but modulated preheating can be effective. For quartic inflation, curvaton-type preheating may be effective but the usual δN formalism has to be modified. We see under what circumstances the recent numerical simulation of Bond et al. [0903.3407] may be enough to provide a rough estimate for this case.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.