BINGO：标量双谱的高效计算代码
BINGO: A code for the efficient computation of the scalar bi-spectrum
摘要：
本文提出了一种新的精确的Fortran程序--双谱和非高斯算子（BINGO），用于计算包含正则标量场的单场暴胀模型的标量双谱和非高斯参数f_{NL}.该代码可以计算所有不同的双谱和参数f_{NL}的波矢量的任意三角形配置的贡献。首先集中在等边极限，我们说明了BINGO的准确性，通过比较的结果从代码与双谱的频谱依赖性，预计在幂律膨胀。然后，考虑到一个任意的三角形配置，我们对比的数值结果与分析表达式中的慢滚限制，例如，传统的二次电位的情况下。考虑到一个非平凡的情况下，涉及从慢滚的偏差，我们比较的结果，从代码的分析结果，最近已获得的情况下，Starobinsky模型的等边极限。作为一个直接的应用程序，我们利用BINGO检查的非高斯参数f_{NL}的权力，以区分不同的通货膨胀模型，承认偏离慢卷，并导致类似的功能，在标量功率谱。最后，我们总结和讨论的影响，我们获得的结果。
英文摘要：
We present a new and accurate Fortran code, the BI-spectra and Non-Gaussianity Operator (BINGO), for the efficient numerical computation of the scalar bi-spectrum and the non-Gaussianity parameter f_{NL} in single field inflationary models involving the canonical scalar field. The code can calculate all the different contributions to the bi-spectrum and the parameter f_{NL} for an arbitrary triangular configuration of the wavevectors. Focusing firstly on the equilateral limit, we illustrate the accuracy of BINGO by comparing the results from the code with the spectral dependence of the bi-spectrum expected in power law inflation. Then, considering an arbitrary triangular configuration, we contrast the numerical results with the analytical expression available in the slow roll limit, for, say, the case of the conventional quadratic potential. Considering a non-trivial scenario involving deviations from slow roll, we compare the results from the code with the analytical results that have recently been obtained in the case of the Starobinsky model in the equilateral limit. As an immediate application, we utilize BINGO to examine of the power of the non-Gaussianity parameter f_{NL} to discriminate between various inflationary models that admit departures from slow roll and lead to similar features in the scalar power spectrum. We close with a summary and discussion on the implications of the results we obtain.
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