Mass and Angular Momentum, Left Ambiguous by Einstein, Get Defined - Quanta Magazine

Surprisingly, 107 years after the introduction of general relativity, the meanings of basic concepts are still being worked out.

In 2008, the mathematicians Mu-Tao Wang of Columbia University and Shing-Tung Yau, now a professor at Tsinghua University in China and an emeritus professor at Harvard University, advanced a definiti… [+5247 chars]

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