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**deandrecooke** · 09-09-2012, 10:44 AM

A bit of background from here

Excellent paragraph IMO. However, what makes spacetime spacetime? I would regard the spacetime variables as meaningless in absolute terms and that we simply define the given variables as spacetime variables. Thus, when we measure energy-momentum, we are constructing the instrument in terms of the given variables, and the energy-momentum we measure is relative to the given variables. In other words, energy-momentum has a definite relationship to spacetime even if energy-momentum and spacetime are meaningless in absolute terms. That is, quantum mechanical operators are relative to the spacetime operators.

09-09-2012, 10:44 AM	#6
deandrecooke Join Date Oct 2005 Posts 493 Senior Member	A bit of background from here Excellent paragraph IMO. However, what makes spacetime spacetime? I would regard the spacetime variables as meaningless in absolute terms and that we simply define the given variables as spacetime variables. Thus, when we measure energy-momentum, we are constructing the instrument in terms of the given variables, and the energy-momentum we measure is relative to the given variables. In other words, energy-momentum has a definite relationship to spacetime even if energy-momentum and spacetime are meaningless in absolute terms. That is, quantum mechanical operators are relative to the spacetime operators.
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