Non-Gaussianity and baryonic isocurvature fluctuations in the curvaton scenario
Non-Gaussianity and baryonic isocurvature fluctuations in the curvaton scenario
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DOI：
10.1016/j.physletb.2008.12.034
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发表时间：
2008-10
影响因子：
4.4
通讯作者：
T. Moroi;Tomo Takahashi
中科院分区：
文献类型：
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作者：
T. Moroi;Tomo Takahashi
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。考虑到暴胀子和曲率子的原初涨落，我们计算了非线性参数fN和重子等曲率涨落。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fNL = 0（10 - 100），而不冲突的约束。
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 fNLand 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 fNL∼O(10–100) without conflicting with the constraints.