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Equation 140 · Part 1 · The Clock That Comes Back Wrong by Exactly Its Mass

Symbol Δ E

ΔE/c2\Delta E/c^2
ΔE\Delta E

What this part means

Δ E 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

Δ E 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

What remains genuinely open, and OBSERVED nowhere yet, is whether the composite-mass instance of this estimator survives contact with a real interferometer once every recoil, laser, and path term the field already knows how to compute is included in full. The thirty-year dispute between Müller, Peters, and Chu on one side and Wolf, Blanchet, Bordé, Reynaud, Salomon, and Cohen-Tannoudji and Sinha and Samuel on the other was not a disagreement about mathematics; both sides agreed on the interferometer phase formula. It was a disagreement about which piece of a correct formula is allowed to be called a measurement of mass. Roura’s and Di Pumpo and collaborators’ answer — a narrow, differential,…

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A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

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