论文标题
使用多标准技术的偏斜频谱对原始非高斯的限制
Constraints on primordial non-Gaussianity using multitracer technique for skew spectrum
论文作者
论文摘要
从大规模结构观察中提取双光谱信息，由于复杂的模型和计算成本，以衡量信号及其协方差。最近，提议以更有效的方式访问双光谱信息的一部分，并已确认它可以向功率谱测量中包含的互补信息提供互补信息。在这项工作中，我们概括了应用多阶段技术并探索其限制局部类型原始非高斯性的能力。使用光谱及其协方差估算得出$ n $ body模拟，我们发现多阶段方法有效地减少了宇宙差异噪声。 $ B_1^2A_S，N_S $和$ f _ {\ rm nl}^{\ rm loc} $的$1σ$边缘化错误减少了50 \％，52 \％和73 \％，仅与从单个轨道轨道中获得的功能谱相比，与结果仅获得的结果相比。它表明，偏斜频谱和多阶段技术都可以通过即将进行的宽大星系调查来限制原始非高斯性。
Extracting the bispectrum information from the large scale structure observations is challenging due to the complex models and the computational costs to measure the signal and its covariance. Recently, the skew spectrum was proposed to access parts of the bispectrum information with a more effective way and has been confirmed it can provide complementary information to that enclosed in the power spectrum measurements. In this work, we generalize the theory to apply the multitracer technique and explore its ability to constrain the local type primordial non-Gaussianity. Using the spectra and their covariance estimated from $N$-body simulations, we find the multitracer approach is effective to reduce the cosmic variance noise. The $1σ$ marginalized errors for $b_1^2A_s, n_s$ and $f_{\rm NL}^{\rm loc}$ are reduced by 50\%, 52\% and 73\% comparing with the results using only power spectrum obtained from a single tracer. It indicate that both the skew spectrum and the multitracer technique are useful to constrain the primordial non-Gaussianity with the forthcoming wide-field galaxy surveys.
