论文标题
重型无菌中微子的宇宙学限制
Cosmological constraints on heavy sterile neutrinos
论文作者
论文摘要
我们考虑沉重的无菌中微子$ν_s$，质量在10 mev $ \ lyssim m_s \ simsimm_π\ sim 135 $ mev中，在早期宇宙中产生的热产生，并在QCD相过渡后冻结。这些中微子的存在可能会改变中微子物种的有效数量$ n _ {\ rm eff} $，以宇宙微波背景（CMB）和BBN期间的$ {}^4 $ HE产生。我们提供了相关Boltzmann方程的解决方案的详细说明，并确定了由当前Planck卫星数据约束的参数空间，并预测了未来阶段4地面CMB（CMB-S4）观察结果探索的参数空间。
We consider heavy sterile neutrinos $ν_s$, with mass in the range 10 MeV $\lesssim m_s \lesssim m_π \sim 135$ MeV, thermally produced in the early universe and freezing out after the QCD phase transition. The existence of these neutrinos may alter the value of the effective number of neutrino species $N_{\rm eff}$, measured by the cosmic microwave background (CMB), and the ${}^4$He production during the BBN. We provide a detailed account of the solution of the relevant Boltzmann equations and we identify the parameter space constrained by current Planck satellite data and forecast the parameter space probed by future Stage-4 ground-based CMB (CMB-S4) observations.
