快速稀释能量密度的宇宙学特征
Cosmological signatures of a Rapid Diluted Energy Density
摘要：
我们研究的宇宙学签名有额外的能量密度，$ρ_{ex}$，超出$Λ$ CDM模型，迅速稀释，比辐射快，在一个比例因子$a_c$与相应的模式$k_c=a_c H(a_c)$穿越视界在那个时候。这些类型的模型是由基础基本粒子的相变激发的，例如从几乎无质量的夸克或最近提出的束缚暗能量模型中产生质子和中子。$ρ_{ex}$的迅速稀释不仅在宇宙的膨胀历史中留下了独特的印记，对声学尺度$r_s(a_cc)$和角距离$D_A(a)$产生了明显的影响，而且还对物质和CMB功率谱产生了影响。快速稀释的能量密度$ρ_{ex}$（RDED）产生的特征信号可以用当前和未来的精确宇宙学数据观察到。特别是，我们发现一个颠簸的物质功率谱相比，标准的$Λ$ CDM。我们确定的幅度，宽度和时间尺度的颠簸的物理性质的过渡。我们研究这些影响与线性理论，标准微扰理论，和宇宙学距离的相关影响，允许独立测量这些扩展的标准$Λ$ CDM模型。
英文摘要：
We study the cosmological signatures of having extra energy density, $ρ_{ex}$, beyond the $Λ$CDM model that dilutes rapidly, faster than radiation, at a scale factor $a_c$ with a corresponding mode $k_c=a_c H(a_c)$ crossing the horizon at that time. These types of models are motivated by phase transitions of the underlying elementary particles, for example the creation of protons and neutrons from almost massless quarks or the recently proposed Bound Dark Energy model. The rapidly dilution of $ρ_{ex}$ leaves distinctive imprints in the Universe not only in the expansion history with a clear impact on the acoustic scale, $r_s(a_cc)$, and angular distances, $D_A(a)$, but also in the matter and CMB power spectra. The rapidly diluted energy density $ρ_{ex}$, (RDED) generates characteristic signatures that can be observed with current and future precision cosmological data. In particular, we find a bump in the matter power spectrum compared to the standard $Λ$CDM. We identify the amplitude, width, and time scale of the bump to the physical properties of the transition. We study these effects with linear theory, standard perturbation theory, and the correlated impact on cosmological distances, allowing for independent measurements of these extensions of the standard $Λ$CDM model.
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