Non-Gaussianity from resonant curvaton decay

Non-Gaussianity from resonant curvaton decay
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共振曲率衰减导致的非高斯性

DOI:
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发表时间:
2009
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影响因子:
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通讯作者:
A. Rajantie
A. Rajantie
中科院分区:
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文献类型:
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作者:
A. Chambers;Sami Nurmi;A. Rajantie

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我们计算了曲率场通过参数共振衰变成另一个标量场的情况下的曲率摄动。由于共振末端的非线性阶段,标准微扰计算技术在这种情况下失效。相反,我们使用晶格场理论模拟和分离宇宙近似来计算曲率微扰作为曲率场的非线性函数。对于测试的参数,产生的扰动是高度非高斯的,不能很好地近似于通常的fNL参数化。共振衰减在曲率情况下起着重要的作用,并且可以对所产生的扰动产生实质性的影响。
We calculate curvature perturbations in the scenario in which the curvaton field decays into another scalar field via parametric resonance. As a result of a nonlinear stage at the end of the resonance, standard perturbative calculation techniques fail in this case. Instead, we use lattice field theory simulations and the separate universe approximation to calculate the curvature perturbation as a nonlinear function of the curvaton field. For the parameters tested, the generated perturbations are highly non-Gaussian and not well approximated by the usual fNL parameterisation. Resonant decay plays an important role in the curvaton scenario and can have a substantial effect on the resulting perturbations.
两个曲线衰减的原始非高斯性
DOI: 10.1103/physrevd.76.103003
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影响因子: 5
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