arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.12617astro-ph.COgr-qchep-phhep-th
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来自HII星暴星系视星等和其它宇宙学测量的宇宙学约束

Cosmological constraints from HII starburst galaxy apparent magnitude and other cosmological measurements

Shulei Cao, Joseph Ryan, Bharat Ratra

摘要:

我们使用HII星爆星系视星等测量来约束六个宇宙学模型中的宇宙学参数。联合分析HII星系,类星体的角尺寸,重子声学振荡的峰值长度尺度,和哈勃参数的测量结果在相对独立的模型和限制性的非相对论性物质密度参数$Ω_{\rm m_0}$和哈勃常数$H_0$的当前值的估计。这些估计有利于2.0 $σ$到3.4 $σ$(取决于宇宙学模型),比从局部膨胀率测量的低$H_0$。合并后的数据与暗能量是一个宇宙学常数和平坦的空间超曲面相一致,但并不强烈排除温和的暗能量动力学或稍微不平坦的空间几何形状。

英文摘要:

We use HII starburst galaxy apparent magnitude measurements to constrain cosmological parameters in six cosmological models. A joint analysis of HII galaxy, quasar angular size, baryon acoustic oscillations peak length scale, and Hubble parameter measurements result in relatively model-independent and restrictive estimates of the current values of the non-relativistic matter density parameter $Ω_{\rm m_0}$ and the Hubble constant $H_0$. These estimates favor a 2.0$σ$ to 3.4$σ$ (depending on cosmological model) lower $H_0$ than what is measured from the local expansion rate. The combined data are consistent with dark energy being a cosmological constant and with flat spatial hypersurfaces, but do not strongly rule out mild dark energy dynamics or slightly non-flat spatial geometries.

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