图 书 馆
第19讲-超级与宇宙的终结Lecture 19 - Mega and the End of the Universe |
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| 课程网址: | http://videolectures.net/yaleastr160s07_bailyn_lec19/ |
| 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: | Class begins with a review of the issues previously addressed about the origin and fate of the universe. The role of gravity in the expansion of the universe is discussed and given as the reason why the rate of expansion cannot remain constant and will eventually slow down. The actual density of the universe is calculated using various methods. Finally, the unsolved problem of dark matter is addressed and two explanatory hypotheses are proposed. One is that the universe is comprised of WIMPs (Weakly Interactive Massive Particles) that fulfill two requirements: they have mass and do not interact with light. The second hypothesis is that dark matter is made of MACHOs (Massive Astrophysical Compact Halo Objects), which scientists have attempted to identify through gravitational lenses. |
| 关 键 词: | 宇宙起源; 解释性假设; 引力透镜 |
| 课程来源: | 视频讲座网 |
| 数据采集: | 2023-03-24：chenjy |
| 最后编审: | 2023-05-13：chenjy |
| 阅读次数: | 26 |