摘要
大爆炸宇宙学模型有6个基本参数一宇宙年龄t0，哈勃常数H0（或哈勃参数h≡H0／100km·s－1·MPc－1），宇宙物质密度参数Ω0，减速因子q0，以及与宇宙学常数A和宇宙的曲率k有关的另外两个参数Ω0A≡A／3H，ΩR≡-K／H。简要介绍了国际上对t0和H0的最近研究进展。由于观测上和理论上都还存在着相当多的不确定因素，目前对这两个参数的取值大小仍然有很大的争议。总的说来，对于宇宙的年龄t0，较普遍的看法是t>11Gyr，其最可见值为t0≈13Ggr。对于哈勃常数H0，如果所测的天体距离尺度较小，则通常给出较大的值h≈0．6-08；而如果所测天体距离尺度较大，则通常给出较小的值h≈0．4－0．6。最近哈勃空间望远镜对M100的观测绘出h≈0．8，这一测量结果仍然含有不确定因素，因而还不能认为H0的大小已有定论。
There are six fundamental parameters in the big bang cosmology-the age of the universe t0, the Hubble constan H0 (or the Hubble parameter h ≡ H0/100km·s-1· Mpc-1), the density paramter of cosmic matter Ω0, the deceleration parameter q0, and ΩA ≡ A/3H and ΩR ≡ -k/H which are related to the cosmological constat and the curvature of the universe, respectively.This paper describes new progress in the study on t0 and H0. The controversy about the values of to and H0 is Still obvious so far due to various uncertaiaties in both observaion and theory.It is genrally believed that t0>11Gyr and most probably t0 ≈ 13Gyr. On the Hubble constat H0, it is usually gives large value h≈0.6-0.8 for smaller distance scales and smaller value h ≈0.4-0.6 for larger distance scales. Recently, the Hubble Space Telescope gives h≈0.8 from the obsotions on M100. Howevr, it is still hardly to say tha the final collclusion has beeh reached because there are still some uncertainties in observations.
出处
《天文学进展》
CSCD
北大核心
1996年第3期219-226,共8页
Progress In Astronomy
关键词
宇宙年龄
爆炸宇宙学
宇宙模型
基本参数
(cosmology)
distance scale-cosmic microwave background-cosmology
observa-tions
cosmology
theory-globular clusters
general-gravitational lensing
