主题：几何直观地介绍广义相对论的时空以及大爆炸模型 （0） -- changshou

in terms of 狭义相对论

with relatively low velocities, the relativity factor gamma approximates to one, and 时空 =经典物理伽利略时空, 低能;

if 高能, sr 四维: 时间, space has to go with lorentz transformation :

光锥- 维基百科，自由的百科全书, read English edition as well if possible;

analogy:even social 时空 cannot be 经典物理伽利略时空 all the time, or we have entropy issue,不進則退, and in a way, Marxist's 按勞分配 has an issue of entropy;

光锥 concept is the critical part of sr 四维, because we need high "velocities" or high gamma or 高能辐射 to progress, technologically or socially, kind of a analogy

经典物理伽利略时空 often 忽悠 our minds, as I wrote about language as a 低能 and 经典物理 communication tool (kind of in the sense of 等價交換) , otherwise how do you do "marketing" to obtain 剩余价值?

光锥, time, space of sr are kind of "local", in terms of gr

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http://en.wikipedia.org/wiki/Lorentz_factor

zh.wikipedia.org/zh-hk/光锥 - 轉為繁體網頁

在狭义相对论中，光锥（英文：Light cone）是闵可夫斯基时空下能够与一个单一事件通过光速存在因果联系的所有点的集合，并且它具有洛伦兹不变性。光锥也可以看作 ...

• nua:"一个爱因斯坦和玻尔都有的成见"