论文标题
压力测试$λ$ CDM与高红移星系候选人
Stress Testing $Λ$CDM with High-redshift Galaxy Candidates
论文作者
论文摘要
来自JWST的早期数据显示，有大量恒星质量的高红移星系候选人。直接关注的是这些候选者与标准宇宙学模型中星系形成的一致性。在$λ$ CDM范式中，银河系的恒星质量（$ M_ \ star $）受到其主机暗物质Halo的可用Baryonic储层的限制。因此，暗物质光环的质量功能对数字密度$ n（> m_ \ star，z）$和恒星质量密度$ρ_ {\ star}（> m_ \ star，z）$比$ m_ \ star $更大。在这里，我在这里表明，JWST观察中最庞大的星系候选者在$ z \ sim 7-10 $处于这些限制的边缘，这表明了一个重要的未解决的问题，即从观测值中获得的星系属性，星系在$λ$ CDM中或在此标准广泛的范围内的早期时间形成。
Early data from JWST have revealed a bevy of high-redshift galaxy candidates with unexpectedly high stellar masses. An immediate concern is the consistency of these candidates with galaxy formation in the standard cosmological model. In the $Λ$CDM paradigm, the stellar mass ($M_\star$) of a galaxy is limited by the available baryonic reservoir of its host dark matter halo. The mass function of dark matter halos therefore imposes an absolute upper limit on the number density $n(>M_\star,z)$ and stellar mass density $ρ_{\star}(>M_\star,z)$ of galaxies more massive than $M_\star$ at any epoch $z$. Here I show that the most massive galaxy candidates in JWST observations at $z\sim 7-10$ lie at the very edge of these limits, indicating an important unresolved issue with the properties of galaxies derived from the observations, how galaxies form at early times in $Λ$CDM, or within this standard cosmology itself.
