论文标题
紫外线光度函数对小规模非高斯的最初限制
First Constraints on Small-Scale Non-Gaussianity from UV Galaxy Luminosity Functions
论文作者
论文摘要
紫外线光度功能提供了有关早期宇宙中星系形成物理学的大量信息。鉴于该探针间接地跟踪了暗物质光环的质量功能的演变，因此它有可能限制结构形成的替代理论。这种情况之一是在观察到宇宙微波背景的观察结果之外，存在原始非高斯的原始非高斯性。通过对光晕质量函数的影响，这种小规模的非高斯性将改变高红移处的大量星系。在这项工作中，我们介绍了由哈勃太空望远镜测量的UV光度的应用，以限制WaveNumbers的非高斯性参数$ f_ \ mathrm {nl} $，而在截止比例$ k _ {\ rm cut} $的临界尺度上方。在未知的天体物理参数和对潜在系统错误的核算中进行边缘化之后，我们到达了$ f _ {\ rm nl} = 71^{+426} _ { - 237} $的$2σ$，用于临界标准$ k _ {\ rm cut} = 0.1 = 0.1 \ n-npc {$ npc {$ in-n-n-n-n { - 237} $ {原始重力潜力的双光谱。此外，我们为詹姆斯·韦伯（James Webb）太空望远镜和南希·格蕾丝·罗马（Nancy Grace Roman）太空望远镜进行预测，发现当前界限的预期$ 3-4 $。
UV luminosity functions provide a wealth of information on the physics of galaxy formation in the early Universe. Given that this probe indirectly tracks the evolution of the mass function of dark matter halos, it has the potential to constrain alternative theories of structure formation. One of such scenarios is the existence of primordial non-Gaussianity at scales beyond those probed by observations of the Cosmic Microwave Background. Through its impact on the halo mass function, such small-scale non-Gaussianity would alter the abundance of galaxies at high redshifts. In this work we present an application of UV luminosity functions as measured by the Hubble Space Telescope to constrain the non-Gaussianity parameter $f_\mathrm{NL}$ for wavenumbers above a cut-off scale $k_{\rm cut}$. After marginalizing over the unknown astrophysical parameters and accounting for potential systematic errors, we arrive at a $2σ$ bound of $f_{\rm NL}=71^{+426}_{-237}$ for a cut-off scale $k_{\rm cut}=0.1\,\mathrm{Mpc}^{-1}$ in the bispectrum of the primordial gravitational potential. Moreover, we perform forecasts for the James Webb Space Telescope and the Nancy Grace Roman Space Telescope, finding an expected improvement of a factor $3-4$ upon the current bound.
