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**mensforyouthis** · 09-09-2012, 11:08 AM

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.

For example, does a momentum measuring device look like a position measuring device in the momentum domain?

09-09-2012, 11:08 AM	#8
mensforyouthis Join Date Oct 2005 Posts 471 Senior Member	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. For example, does a momentum measuring device look like a position measuring device in the momentum domain?
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