Cosmology with the EFTofLSS and BOSS: dark energy constraints and a note on priors
Cosmology with the EFTofLSS and BOSS: dark energy constraints and a note on priors
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DOI：
10.1088/1475-7516/2023/01/028
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发表时间：
2022-07
影响因子：
6.4
通讯作者：
P. Carrilho;C. Moretti;A. Pourtsidou
中科院分区：
文献类型：
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作者：
P. Carrilho;C. Moretti;A. Pourtsidou
我们分析了BOSS DR 12多极的星系功率谱联合测量的BAO规模为三个不同的模型的暗能量。我们使用最近的测量与无窗估计，和一个独立的和快速的流水线的基础上EFTofLSS建模实现通过快速PT算法来计算红移空间环路校正的积分。我们加速我们的分析，进一步使用bandwidth线性功率谱仿真器，而不是玻尔兹曼求解器。我们进行了两组分析：一组包括As和ns的3σ Planck先验，另一组完全不含CMB，即，让原始参数自由变化我们研究的第一个模型是ΛCDM，在其中我们重现了以前用相同估计量得到的结果。我们发现一个较低的值的标量振幅在CMB的情况下，与许多以前的EFT为基础的完整的形状分析的BOSS数据。然后，我们研究wCDM，发现一个较低的值的振幅在CMB的自由运行，再加上一个偏好的幻影暗能量与w = -1.17+0.12-0.11，再次在广泛的协议与以前的结果。最后，我们研究了相互作用暗能量的暗散射模型，我们标记为wACDM。在无CMB的分析中，我们发现相互作用强度A和振幅As之间存在较大的简并，阻碍了这些参数的测量。相反，在我们的运行与CMB之前，我们能够约束暗能量参数为w = -0.972+0.036 -0.029和A = 3.9+3.2-3.7，这表明了1σ暗示的相互作用暗能量。这是该参数的第一次测量，证明了该模型缓解σ 8张力的能力。我们的分析可以作为任何模型的分析与规模无关的增长的指导。最后，我们研究的依赖性的结果施加在滋扰参数的先验，并发现这些先验信息，其扩大产生的变化的轮廓。我们主张深入研究这个问题，这可能会影响当前和即将到来的LSS数据分析。
We analyse the BOSS DR12 multipoles of the galaxy power spectrum jointly with measurements of the BAO scale for three different models of dark energy. We use recent measurements performed with a windowless estimator, and an independent and fast pipeline based on EFTofLSS modelling implemented via the FAST-PT algorithm to compute the integrals of the redshift-space loop corrections. We accelerate our analysis further by using the bacco linear power spectrum emulator instead of a Boltzmann solver. We perform two sets of analyses: one including 3σ Planck priors on As and ns , and another that is fully CMB-free, i.e., letting the primordial parameters vary freely. The first model we study is ΛCDM, within which we reproduce previous results obtained with the same estimator. We find a low value of the scalar amplitude in the CMB-free case, in agreement with many previous EFT-based full-shape analyses of the BOSS data. We then study wCDM, finding a lower value of the amplitude in the CMB-free run, coupled with a preference for phantom dark energy with w = -1.17+0.12 -0.11, again in broad agreement with previous results. Finally, we investigate the dark scattering model of interacting dark energy, which we label wACDM. In the CMB-free analysis, we find a large degeneracy between the interaction strength A and the amplitude As , hampering measurements of those parameters. On the contrary, in our run with a CMB prior, we are able to constrain the dark energy parameters to be w = -0.972+0.036 -0.029 and A = 3.9+3.2 -3.7, which show a 1σ hint of interacting dark energy. This is the first measurement of this parameter and demonstrates the ability of this model to alleviate the σ 8 tension. Our analysis can be used as a guide for the analysis of any model with scale-independent growth. Finally, we study the dependence of the results on the priors imposed on the nuisance parameters and find these priors to be informative, with their broadening generating shifts in the contours. We argue for an in depth study of this issue, which can affect current and forthcoming analyses of LSS data.