利用星系偏置的混合有效场论方法从DES Y1数据中大大增强宇宙学约束
Hefty enhancement of cosmological constraints from the DES Y1 data using a Hybrid Effective Field Theory approach to galaxy bias
摘要：
我们从第一年的暗能量调查数据（DES Y1）中重新分析了宇宙剪切和星系聚类，利用混合有效场论（HEFT）方法在弱非线性尺度上模拟星系-物质关系，最初在Modi等人（2020）（arXiv：1910.07097）中提出。这使我们能够探索宇宙学约束力的增强，通过扩展通常用于预测大尺度结构分析的星系团尺度范围来实现。我们的分析是基于重新计算的谐波空间数据向量和协方差矩阵，仔细考虑模式耦合，非高斯性和散粒噪声的所有来源，这使我们能够提供强大的拟合优度的措施。我们使用\textsc{AbacusSummit}模拟套件来构建HEFT模型预测的仿真器。我们发现这个模型可以解释波数为$k_{\rm max}\sim 0.6\, {\rm Mpc}^{-1}$的星系成团和剪切数据。我们将$(S_8,Ω_m) = (0.786\pm 0.020,0.273^{+0.030}_{-0.036})$约束在基准$k_{\rm max}\sim 0.3\, {\rm Mpc}^{-1}$上，在$k_{\rm max}\sim 0.5\, {\rm Mpc}^{-1}$上改进为$(S_8,Ω_m) = (0.786^{+0.015}_{-0.018},0.266^{+0.024}_{-0.027})$。这代表了$\sim10\%$和$\sim35\%$对分别在两个参数上使用缩小尺度范围（$k_{\rm max}\lesssim0.15\,{\rm Mpc}^{-1}$）上的线性偏差关系导出的约束的改进，尽管HEFT模型中涉及15个附加参数。我们研究HEFT是否可以用于约束哈勃参数并找到$H_0= 70.7_{-3.5}^{+3.0}\,{\rm km}\,s^{-1}\,{\rm Mpc}^{-1}$。我们的限制是调查性的，并受到文中讨论的某些警告。
英文摘要：
We present a re-analysis of cosmic shear and galaxy clustering from first-year Dark Energy Survey data (DES Y1), making use of a Hybrid Effective Field Theory (HEFT) approach to model the galaxy-matter relation on weakly non-linear scales, initially proposed in Modi et al. (2020) (arXiv:1910.07097). This allows us to explore the enhancement in cosmological constraining power enabled by extending the galaxy clustering scale range typically used in projected large-scale structure analyses. Our analysis is based on a recomputed harmonic-space data vector and covariance matrix, carefully accounting for all sources of mode-coupling, non-Gaussianity and shot noise, which allows us to provide robust goodness-of-fit measures. We use the \textsc{AbacusSummit} suite of simulations to build an emulator for the HEFT model predictions. We find that this model can explain the galaxy clustering and shear data up to wavenumbers $k_{\rm max}\sim 0.6\, {\rm Mpc}^{-1}$. We constrain $(S_8,Ω_m) = (0.786\pm 0.020,0.273^{+0.030}_{-0.036})$ at the fiducial $k_{\rm max}\sim 0.3\, {\rm Mpc}^{-1}$, improving to $(S_8,Ω_m) = (0.786^{+0.015}_{-0.018},0.266^{+0.024}_{-0.027})$ at $k_{\rm max}\sim 0.5\, {\rm Mpc}^{-1}$. This represents a $\sim10\%$ and $\sim35\%$ improvement on the constraints derived respectively on both parameters using a linear bias relation on a reduced scale range ($k_{\rm max}\lesssim0.15\,{\rm Mpc}^{-1}$), in spite of the 15 additional parameters involved in the HEFT model. We investigate whether HEFT can be used to constrain the Hubble parameter and find $H_0= 70.7_{-3.5}^{+3.0}\,{\rm km}\,s^{-1}\,{\rm Mpc}^{-1}$. Our constraints are investigative and subject to certain caveats discussed in the text.
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