View Single Post
Feb7-10, 09:08 PM
Sci Advisor
P: 7,632
I'm not sure why the title contains the word "crank"? The title is rather unfortunate, fortunately the thread doesn't seem to be about what the title claims.

Anyway, my general view is that energy and momentum are core physical concepts, but the concept of "mass" is less well defined, particularly as it applies to GR. Many discussions would be better off if the word were avoided and the focus kept on what was well defined.

See for instance

The problem in my opinion isn't really that "There is no good concept of mass", as the above article purports, the problem is "There are too many good concepts of mass". For example, in GR we have Komar, Bondi, and ADM masses as the "top three", along with an uncertain number of other proposals.