On 12/18/2017 11:44 PM, [email protected] wrote:
Invariants are always the important things in physics because they
are what we can have intersubjective agreement on.
Brent
*IIUC, the field equations are covariant, which means coordinate
system independent. *
Right. Covariant means that something that changes in such a way that
invariant things remain the same. So vectors components transform
covariantly so that they keep the vector physically the same.
*Isn't Newton's Law of Gravitation also coordinate independent? That
is, if we use Newton to calculate the planetary orbits, won't we get
the same results in different coordinate systems? *
Right.
*... Is there a distinction in GR between frame independence and
coordinate independence? AG*
I'd say frame independence is a special case of coordinate
independence. It refers only to relative motion of coordinate frames.
Brent
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