论文标题
使用IA类型超新星数据和观察性哈勃参数数据测试反应效应
Testing backreaction effects with type Ia supernova data and observational Hubble parameter data
论文作者
论文摘要
在空间平均的非均匀宇宙中，反应术语$ {\ cal q} _ \ cd $和平均的空间ricci scalar $ \平均{\ cr} $可用于合并有效的完美流体能量密度$ \ varrho _ { eff}^{\ cd} $，可以被视为反应效果的新有效来源。为了模拟逆向反应的现实演变，我们采用了有效完美流体的状态方程（EOS）的chevallier-polarski-linder（CPL）参数化。为了处理反应背景下的观察，我们使用两个指标来描述晚期宇宙，其中一个是标准的Friedmann-Lema \^ıtre-Robertson-Walker（FLRW）指标，另一个是Larena等引入的Emanting Curvature Carvature参数。 al。在\ cite {Larena2009 -Testing}中。 We also fit the CPL backreaction model using type Ia supernova(SN Ia) data and observational Hubble parameter data(OHD) with these two metrics, and find out that parameter tensions between two different data sets are larger when the backreaction model is equipped with the template metric, therefore we conclude that the prescription of the geometrical instantaneous spatially-constant curvature $κ_ {\ cd} $需要修改。
The backreaction term ${\cal Q}_\CD$ and the averaged spatial Ricci scalar $\average{\CR}$ in the spatially averaged inhomogeneous Universe can be used to combine into effective perfect fluid energy density $\varrho_{\rm eff}^{\CD}$ and pressure $p_{\rm eff}^{\CD}$ that can be regarded as new effective sources for the backreaction effects. In order to model the realistic evolution of backreaction, we adopt the Chevallier-Polarski-Linder(CPL) parameterizations of the equation of state(EoS) of the effective perfect fluid. To deal with observations in the backreaction context, in this paper, we employ two metrics to describe the the late time Universe, one of them is the standard Friedmann-Lema\^ıtre-Robertson-Walker(FLRW) metric, and the other is a template metric with an evolving curvature parameter introduced by Larena et. al. in \cite{larena2009testing}. We also fit the CPL backreaction model using type Ia supernova(SN Ia) data and observational Hubble parameter data(OHD) with these two metrics, and find out that parameter tensions between two different data sets are larger when the backreaction model is equipped with the template metric, therefore we conclude that the prescription of the geometrical instantaneous spatially-constant curvature $κ_{\CD}$ needs to be modified.
