论文标题
带有eftoflss和boss的宇宙学：深色能量限制和先验的注释
Cosmology with the EFTofLSS and BOSS: dark energy constraints and a note on priors
论文作者
论文摘要
我们与BAO数据共同分析了Boss DR12 Galaxy Power Spectrum数据，用于三种暗能模型。我们使用无窗估计器以及基于通过快速PT算法实现的EFTOFLSS的独立和快速管道使用的最新测量结果来计算红移空间回路校正。我们通过使用BACCO线性模拟器而不是玻尔兹曼求解器来加速分析。我们执行两组分析：一套$ A_S $和$ n_s $的$3σ$ Planck先验，另一套为CMB，没有此类先验。首先，我们研究$λ$ CDM，再现与相同估计器获得的先前结果。在无CMB的情况下，我们发现$ a_s $的较低值与以前对BOSS数据进行了许多完整的分析一致。然后，我们研究$ W $ CDM，在无CMB的运行中找到幅度较低的幅度值，再加上偏爱幻影深色能量，$ W = -1.17^{+0.12} _ { - 0.11} $，再次与先前的结果相吻合。最后，我们研究了深色散射模型，我们将其标记为$ wa $ cdm。在无CMB分析中，我们发现交互强度$ a $和振幅$ a_s $之间的大量变性，阻碍了这些参数的测量。相反，在我们以CMB之前的运行中，我们能够将暗能参数限制为$ W = -0.972^{+0.036} _ { - 0.029} $和$ a = 3.9^{+3.9^{+3.2} _ { - 3.7} $，显示1 $ $ coothots互动的互动的黑暗。这是该参数的第一个测量，并演示了该模型减轻$σ_8$张力的能力。我们的分析可以用作任何具有比例无关增长的模型的指南。最后，我们研究了结果对滋扰参数先验的依赖性，并发现这些先验是有益的，它们的扩展会在轮廓中产生变化。我们主张对此问题进行深入研究，这可能会影响对LSS数据的当前和即将进行的分析。
We analyse the BOSS DR12 galaxy power spectrum data jointly with BAO data for three models of dark energy. We use recent measurements using a windowless estimator, and an independent and fast pipeline based on EFTofLSS implemented via the FAST-PT algorithm to compute the redshift-space loop corrections. We accelerate our analysis by using the BACCO linear emulator instead of a Boltzmann solver. We perform two sets of analyses: one with $3σ$ Planck priors on $A_s$ and $n_s$, and another that is CMB-free, without such priors. Firstly, we study $Λ$CDM, reproducing previous results obtained with the same estimator. We find a low value of $A_s$ in the CMB-free case, in agreement with many previous full-shape analyses of the BOSS data. We then study $w$CDM, 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, which we label $wA$CDM. In the CMB-free analysis, we find a large degeneracy between the interaction strength $A$ and the amplitude $A_s$, 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 1$σ$ 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 any model with scale-independent growth. Finally, we study the dependence of the results on the priors of the nuisance parameters and find these priors to be informative, with their broadening creating shifts in the contours. We argue for an in depth study of this issue, which can affect current and forthcoming analyses of LSS data.
