论文标题
预聚类时代的能量注入和边缘检测
Energy injection in pre-recombination era and EDGES detection
论文作者
论文摘要
我们研究了在预聚类时代通过能量注射来解释最近的边缘检测的可能性。我们的目的是表明该能量注入的残留物可以在频率$ x_e \ equivhν/（kt）\ simeq 10^{ - 3} $下的能量密度增加，这是解释边缘结果所需的。我们考虑了两种能量注射模型：高斯曲线，具有固定的注射红移和非相关粒子的辐射衰减。我们表明，能量注入应发生在红移范围内$ z \ Lessim 4 \ times 10^3 $，以防止免费的免费工艺对注入能量进行热量化。注射的能量应接近CMB强度为$ x_e \ simeq 10^{ - 3} $的200--1000倍，以获取必要的残基。注射能量的很大一部分被热化，因此会扭曲CMB光谱。我们计算了两个模型的CMB光谱失真，并表明CMB能量密度的分数变化为$Δρ_{\ rm \ scriptScriptScriptScriptScriptScriptScriptScriptScriptStyle cmb}/ρ_{\ rm \ rm \ scriptsscriptstyle cmb} \ simeq 10^{-6} $，可能会发现pucciquciquical prescractione prescractione prescractione percciencencence pix。我们还概述了我们提出的方案对CMB各向异性的含义。
We study the possibility of explaining the recent EDGES detection by an energy injection in the pre-recombination era. Our aim is to show that the residue of this energy injection could give the resultant increase in the energy density at frequencies $x_e \equiv hν/(kT) \simeq 10^{-3}$, which is needed to explain the EDGES result. We consider two models of energy injection: Gaussian profile with a fixed redshift of injection and radiative decay of a non-relativistic particle. We show that the energy injection should occur in the redshift range $z\lesssim 4 \times 10^3$ to prevent free-free processes from thermalizing the injected energy. The injected energy should be nearly 200--1000 times the CMB intensity at $x_e \simeq 10^{-3}$ to obtain the requisite residue. A large fraction of the injected energy gets thermalized and therefore distorts the CMB spectrum. We compute CMB spectral distortion for both the models and show that the fractional change in CMB energy density, $Δρ_{\rm \scriptscriptstyle CMB}/ρ_{\rm \scriptscriptstyle CMB} \simeq 10^{-6}$, which might be detectable with the proposed experiment PIXIE. We also outline the implication of our proposed scenario for CMB anisotropies.
