论文标题
通过非参数方法重建暗能量密度
Reconstruction of dark energy density by non-parametric approaches
论文作者
论文摘要
黑暗能量密度的演变是理解深色能量本质的关键量。通常，该数量由所谓的状态方程描述，即暗能量压力与其密度的比率。在这种情况下，深色能量密度在整个宇宙历史上总是很积极，并且不允许负值。假设有同质和各向同性的宇宙，我们直接从观察数据中重建了暗能量密度，并通过宇宙历史研究了其演变。我们考虑最新的SNIA，BAO和COSMIC CERMIC数据数据，并重建平面和非平板宇宙中的暗能量密度，直至RedShift $ Z \ SIM 3 $。结果与$λ$ cdm达到了$λ$ CDM的一致性，直到RedShift $ Z \ SIM 1.5 $，而在我们的分析中，所有数据和方法在高红移时都提供了负的暗能量密度。
The evolution of dark energy density is a crucial quantity in understanding the nature of dark energy. Often, the quantity is described by the so-called equation of state, that is the ratio of dark energy pressure to its density. In this scenario, the dark energy density is always positive throughout cosmic history and a negative value is not allowed. Assuming a homogeneous and isotropic universe, we reconstruct the dark energy density directly from observational data and investigate its evolution through cosmic history. We consider the latest SNIa, BAO and cosmic chronometer data and reconstruct the dark energy density in both flat and non-flat universes up to redshift $z\sim 3$. The results are well in agreement with the $Λ$CDM up to redshift $z\sim 1.5$, whereas all data and methods, in our analysis, provide a negative dark energy density at high redshifts.
