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Equation 121 · Part 1 · The Clock That Comes Back Wrong by Exactly Its Mass

Symbol L_rm P

LP\mathcal L_{\rm P}
LPL_{\rm P}

What this part means

going to mean anything operationally, it cannot live in the part of an interferometer phase that the weak equivalence principle already forbids from carrying mass information.

Its job in the formula

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

Where the article explains it

If the phase debt of LP\mathcal L_{\rm P} is going to mean anything operationally, it cannot live in the part of an interferometer phase that the weak equivalence principle already forbids from carrying mass information.

The passage around this formula

…is required to cancel from it; a claimed mass-dependence surviving in the leading term would itself be evidence against the weak equivalence principle, not evidence for a working mass gauge. If the phase debt of LP\mathcal L_{\rm P} is going to mean anything operationally, it cannot live in the part of an interferometer phase that the weak equivalence principle already forbids from carrying mass information.

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Sources cited in the surrounding passage

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