The growth rate of large-scale structure provides a powerful consistency test of the standard cosmological model and a probe of possible deviations from general relativity. We use a Fisher analysis to forecast constraints on the growth rate from a combination of next-generation spectroscopic surveys. In the overlap survey volumes, we use a multi-tracer analysis to significantly reduce the effect of cosmic variance. The non-overlap individual survey volumes are included in the Fisher analysis in order to utilise the entire volume. We use the observed angular power spectrum, which naturally includes all wide-angle and lensing effects and circumvents the need for an Alcock-Paczynski correction. Cross correlations between redshift bins are included by using a novel technique to avoid computation of the sub-dominant contributions. Marginalising over the standard cosmological parameters, as well as the clustering bias in each redshift bin, we find that the precision on $\gamma$ improves on the best single-tracer precision by up to $\sim$50\%.

中文翻译：

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通过结合多个未来调查来约束增长率

大尺度结构的增长速度为标准宇宙学模型提供了强有力的一致性检验，也为探索与广义相对论可能存在的偏差提供了机会。我们使用费舍尔分析来预测下一代光谱调查组合对增长率的限制。在重叠调查卷中，我们使用多示踪分析来显着降低宇宙方差的影响。非重叠的单个调查卷包含在 Fisher 分析中，以便利用整个卷。我们使用观察到的角功率谱，它自然包括所有广角和透镜效应，并避免了对 Alcock-Paczynski 校正的需要。通过使用一种避免计算次显性贡献的新技术来包括红移箱之间的互相关。