The invariant mass of special relativity:

[itex]m_0{^2} = E^2 – p^2[/itex]

There doesn't seem to be any quantity with units of mass that is invariant in general relativity. Invariant mass loses significance, as other than an approximation where space-time is sufficient flat.

But at the same time, mass is a fundamental unit (or seems to be). As well, it is difficult to see how local propagations at other c can be expressed without something to slow things down. As far as I know, without adding mass, ad hoc, field phase propagates locally at c.

Is there a quantity that replaces invariant mass in the general theory?

[itex]m_0{^2} = E^2 – p^2[/itex]

There doesn't seem to be any quantity with units of mass that is invariant in general relativity. Invariant mass loses significance, as other than an approximation where space-time is sufficient flat.

But at the same time, mass is a fundamental unit (or seems to be). As well, it is difficult to see how local propagations at other c can be expressed without something to slow things down. As far as I know, without adding mass, ad hoc, field phase propagates locally at c.

Is there a quantity that replaces invariant mass in the general theory?

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