原初功率谱的局域增强与早期亮星系的丰度
Localized Enhancements of the Primordial Power Spectrum and the Abundance of Early Bright Galaxies
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- Sharif University of Technology（谢里夫理工大学）
- Federal University of Paraíba（帕拉伊巴联邦大学）
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中文总结 AI 辅助
研究局域高斯增强的原初功率谱对早期亮星系丰度的影响，通过Sheth-Tormen质量函数和半解析光度映射，发现小尺度凸起可增强高红移稀有晕并解释JWST观测，但受小尺度约束限制，仅为部分贡献。
中文摘要 AI 辅助
詹姆斯·韦布空间望远镜近期对高红移亮星系的观测，激发了对能够增强早期大质量暗物质晕丰度的宇宙学机制的新兴趣。我们研究了一种原初曲率功率谱的现象学修正，其形式为局域高斯增强。修正后的谱被传播到线性物质功率谱、平滑密度方差以及Sheth-Tormen晕质量函数。我们表明，以小尺度为中心的凸起可以选择性地增强稀有高红移晕的丰度，并通过晕质量与紫外光度之间的固定半解析映射，将紫外光度函数的亮端向JWST测量值移动。由于稀有晕尾部对方差的指数敏感性，这种增强在更高红移处变得更加显著。我们强调，这种效应受到小尺度功率谱约束的限制，特别是莱曼α森林数据，应被解释为对JWST星系张力的部分宇宙学贡献，而非完整解决方案。
英文摘要
Recent observations of bright galaxies at high redshifts by the James Webb Space Telescope have motivated renewed interest in cosmological mechanisms that can enhance the abundance of early massive dark matter halos. We study a phenomenological modification of the primordial curvature power spectrum in the form of a localized Gaussian enhancement. The modified spectrum is propagated to the linear matter power spectrum, the smoothed density variance, and the Sheth-Tormen halo mass function. We show that a bump centered at small scales can selectively enhance the abundance of rare high-redshift halos and, through a fixed semi-analytic mapping between halo mass and ultraviolet luminosity, shift the bright end of the UV luminosity function toward JWST measurements. The enhancement becomes more pronounced at higher redshift due to the exponential sensitivity of the rare-halo tail to the variance. We emphasize that the effect is limited by small-scale power-spectrum constraints, particularly Lyman-$α$ forest data, and should be interpreted as a partial cosmological contribution rather than a complete solution to the JWST galaxy tension.
