LSS微扰方法的筛选
Screening in perturbative approaches to LSS
摘要：
宇宙学常数Λ的一个特定值可以解释晚期宇宙加速。然而，在所谓的宇宙学常数问题的推动下，已经探索了几种替代机制。到目前为止，已经有大量的动力学暗能量模型和修正的引力模型。超越ΛCDM通常会带来额外的自由度（dofs）。为了通过现有的观察测试，必须建立有效的筛选机制。结构形成的线性和准线性区域是这种自由度的理想探针，并且可以捕获筛选的开始。在这里，我们提出了一个半唯象的治疗占屏蔽动力学LSS观测，特别强调Vainshtein型筛选。
英文摘要：
A specific value for the cosmological constant, Λ, can account for late-time cosmic acceleration. However, motivated by the so-called cosmological constant problem(s), several alternative mechanisms have been explored. To date, a host of well-studied dynamical dark energy and modified gravity models exists. Going beyond ΛCDM often comes with additional degrees of freedom (dofs). For these to pass existing observational tests, an efficient screening mechanism must be in place. The linear and quasi-linear regimes of structure formation are ideal probes of such dofs and can capture the onset of screening. We propose here a semi-phenomenological treatment to account for screening dynamics on LSS observables, with special emphasis on Vainshtein-type screening.
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