Constraining primordial non-Gaussianity with bispectrum and power spectrum from upcoming optical and radio surveys
Constraining primordial non-Gaussianity with bispectrum and power spectrum from upcoming optical and radio surveys
复制标题
用即将到来的光学和射电勘测中的双谱和功率谱来约束原始非高斯性
DOI：
10.1093/mnras/sty1029
复制
发表时间：
2018
影响因子：
4.8
通讯作者：
L. Verde
中科院分区：
文献类型：
--
作者：
D. Karagiannis;A. Lazanu;M. Liguori;A. Raccanelli;N. Bartolo;L. Verde
我们预测约束的原始非高斯性（PNG）和偏差参数的测量星系功率谱和双谱在未来的无线电连续谱和光学调查。在星系双谱中，我们考虑了一个全面的影响列表，包括非高斯初始条件下的偏差扩展到二阶，红移空间扭曲，红移的不确定性和理论误差。所有这些影响都首次合并在一个单一的PNG预测中。此外，我们改进了双谱模型在以前的预测，占三谱的贡献。所有效应都会对最终预测边界产生影响，而最终预测边界会因调查类型而异。我们发现，双谱可以导致改进的一个因素$\sim 5$的界限的基础上单独的功率谱，导致显着更好的约束本地型PNG，相对于从\textit{普朗克}的电流限制。未来的射电和测光测量可以获得$\sigma（f_{\mathrm{NL}}^{\mathrm{loc}}）\approximately 0.2$的测量误差。在等边PNG的情况下，星系双谱可以改善目前的界限，只有当显着改善在未来的红移测定，大体积，测光或无线电调查可以实现。对于正交非高斯性，预期约束通常与当前约束相当。
We forecast constraints on primordial non-Gaussianity (PNG) and bias parameters from measurements of galaxy power spectrum and bispectrum in future radio continuum and optical surveys. In the galaxy bispectrum, we consider a comprehensive list of effects, including the bias expansion for non-Gaussian initial conditions up to second order, redshift space distortions, redshift uncertainties and theoretical errors. These effects are all combined in a single PNG forecast for the first time. Moreover, we improve the bispectrum modelling over previous forecasts, by accounting for trispectrum contributions. All effects have an impact on final predicted bounds, which varies with the type of survey. We find that the bispectrum can lead to improvements up to a factor $\sim 5$ over bounds based on the power spectrum alone, leading to significantly better constraints for local-type PNG, with respect to current limits from \textit{Planck}. Future radio and photometric surveys could obtain a measurement error of $\sigma(f_{\mathrm{NL}}^{\mathrm{loc}}) \approx 0.2$. In the case of equilateral PNG, galaxy bispectrum can improve upon present bounds only if significant improvements in the redshift determinations of future, large volume, photometric or radio surveys could be achieved. For orthogonal non-Gaussianity, expected constraints are generally comparable to current ones.
影响因子：
6.4
作者：
M. Pietroni
通讯作者：
M. Pietroni
DOI：
10.1111/j.1365-2966.2011.18761.x
发表时间：
2011
影响因子：
4.8
作者：
A. Elia;S. Kulkarni;C. Porciani;M. Pietroni;S. Matarrese
通讯作者：
S. Matarrese