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Equation 31 · Part 1 · The Corner of the Equivalence Principle No Experiment Has Touched

Symbol hateta

η^\hat\eta
η^\hat\eta

What this part means

hateta 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

hateta 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

…entangled component specifically because it is one of several theory families that predict where, if anywhere, a nonzero η^ent\hat\eta_{ent} should show up. A violation confined to the entangled component alone — every other η^\hat\eta consistent with zero, η^ent\hat\eta_{ent} not — would be invisible to every experiment run to date, by the independence proof above, and would point specifically at theories in which gravity treats a genuinely joint quantum state differently from any classical or product-state stand-in for it:…

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Sources cited in the surrounding passage

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