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arXiv 0810.0189hep-phastro-phhep-th
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非高斯性和重子等曲率涨落

Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario

Takeo Moroi, Tomo Takahashi

摘要:

我们讨论非高斯性和重子等曲率波动的曲率的情况下,假设宇宙的重子不对称性起源于膨胀的衰变产物。当在这样的情况下实现大的非高斯性时,也可以产生非零重子等曲率波动,除非重子生成发生在曲率衰变之后。我们计算了非线性参数fNL和重子等曲率涨落,同时考虑了暴胀子和曲率子的原初涨落。我们表明,虽然目前的约束等曲率波动是严重的,非线性参数可以大到f_NL \sim O(10-100),而不冲突的约束。

英文摘要:

We discuss non-Gaussianity and baryonic isocurvature fluctuations in the curvaton scenario, assuming that the baryon asymmetry of the universe originates only from the decay products of the inflaton. When large non-Gaussianity is realized in such a scenario, non-vanishing baryonic isocurvature fluctuations can also be generated unless the baryogenesis occurs after the decay of the curvaton. We calculate the non-linearity parameter f_NL and the baryonic isocurvature fluctuations, taking account of the primordial fluctuations of both the inflaton and the curvaton. We show that, although current constraints on isocurvature fluctuations are severe, the non-linearity parameter can be large as f_NL \sim O(10-100) without conflicting with the constraints.

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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