σ8
外观
σ8是在半径为 8 h-1 Mpc 的球内物质分布功率谱的均方根线性涨落,即(White, Efstathiou & Frenk 1993)。σ8的倒数被定义为偏差参数(bias parameter)(Evrard 1989)。
参考文献
[编辑]- Evrard, August E. Biased Cold Dark Matter Theory: Trouble from Rich Clusters?. ApJ Letters. 1989, 341: L71. Bibcode:1989ApJ...341L..71E. doi:10.1086/185460.
- White, S. D. M.; Efstathiou, G.; Frenk, C. S. The amplitude of mass fluctuations in the universe. MNRAS. 1993, 262 (4): 1023–1028. Bibcode:1993MNRAS.262.1023W. doi:10.1093/mnras/262.4.1023.