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Equation 111 · Part 1 · No Particle Without a Cosigner

Symbol D_rm det

DdetD_{\rm det}
DdetD_{\rm det}

What this part means

DrD_rm det is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

DrD_rm det is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

The passage around this formula

…under mere reparametrization, and must not be dominated by unmatched detector design masquerading as a trajectory effect. Both were tested directly rather than assumed: reparametrization invariance follows from building DdetD_{\rm det} entirely out of proper time and proper-frame quantities, with no coordinate freedom left to exploit; and the coupling-type argument above shows explicitly, in closed form, that an unmatched instrument does move DdetD_{\rm det} even on a single, fixed worldline — which is not a failure of…

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