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第20讲-暗物质Lecture 20 - Dark Matter |
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| 课程网址: | http://videolectures.net/yaleastr160s07_bailyn_lec20/ |
| 主讲教师: | Charles Bailyn |
| 开课单位: | 耶鲁大学 |
| 开课时间: | 2009-11-24 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | This lecture introduces an important concept related to the past and future of the universe: the Scale factor, which is a function of time. With reference to a graph whose coordinates are the Scale factor and time, the problem of dark matter is addressed again. Cosmological redshifts are measured to determine the scale of the universe. The discovery of the repulsive, anti-gravitational force of dark energy is explained. The lecture concludes with discussion of Einstein's biggest mistake: the invention of the cosmological constant to balance gravity. |
| 关 键 词: | 重要概念; 比例因子; 宇宙学常数 |
| 课程来源: | 视频讲座网 |
| 数据采集: | 2023-04-18：chenjy |
| 最后编审: | 2023-05-13：chenjy |
| 阅读次数: | 26 |