Model-independent Reconstruction of Dark Energy Density from Current Observations

被引：4

作者：

Mehrabi, Ahmad ^{[1
]}

Vazirnia, Maryam ^{[1
]}

机构：

[1] Bu Ali Sina Univ, Dept Phys, Hamadan 65178, Hamadan, Iran

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 932卷 / 02期

关键词：

EQUATION-OF-STATE; COSMOLOGICAL CONSTANT; EXPANSION HISTORY; GROWTH-RATE; CONSTRAINTS; SUPERNOVAE; UNIVERSE; LAMBDA; SAMPLE;

D O I：

10.3847/1538-4357/ac6fda

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The evolution of the dark energy (DE) density is a crucial quantity for understanding the nature of DE. Often, the quantity is described by the so-called equation of state; that is, the ratio of the DE pressure to its density. In this scenario, the DE density is always positive throughout cosmic history, and a negative value is not allowed. Assuming a homogeneous and isotropic universe, we reconstruct the DE density directly from observational data and investigate its evolution throughout cosmic history. We consider the latest Type Ia supernova, baryon acoustic oscillation, and cosmic chronometer data, and reconstruct the DE density in both flat and nonflat universes up to redshift z similar to 3. The results are well in agreement with ?CDM up to redshift z similar to 1.5, but we see a weak sign of negative DE density at high redshifts.

引用

页数：6

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