论文标题
非线性方案中挤压双光谱的模型
A Model for the Squeezed Bispectrum in the Non-Linear Regime
论文作者
论文摘要
我们提出了一个挤压暗物质双光谱的模型，其中短模式在非线性方案中深处。我们利用大规模结构的一致性关系与响应函数方法相结合，以简短模式的一些未知函数来编写挤压双光谱。我们为这些响应函数提供了拟合函数的ANSATZ，检查所得模型是否与一环挤压双光谱相比是可靠的。然后，我们从数值模拟中测试了模型，该模型的短模式在$ k \ sim 0.1 \，h/$ mpc和$ k \ sim 0.7 \，redshift $ z = 0 $之间的模型测试。为了评估模型拟合度的良好性，我们实施了非高斯协方差，并在$ 1 $ - $σ$的标准偏差范围内找到了模拟数据的标准偏差。
We present a model for the squeezed dark matter bispectrum, where the short modes are deep in the non-linear regime. We exploit the consistency relations for large-scale structures combined with a response function approach to write the squeezed bispectrum in terms of a few unknown functions of the short modes. We provide an ansatz for a fitting function for these response functions, checking that the resulting model is reliable when compared to the one-loop squeezed bispectrum. We then test the model against measured bispectra from numerical simulations for short modes ranging between $k \sim 0.1 \, h/$Mpc, and $k \sim 0.7 \, h/$Mpc at redshift $z=0$. To evaluate the goodness of the fit of our model we implement a non-Gaussian covariance and find agreement within $1$-$σ$ standard deviation of the simulated data.
