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The Einstein-Podolsky-Rosen (EPR) paradox gives an argument for theincompleteness of quantum mechanics based on the premises of local realism. Ageneral view is that the argument is compromised, because EPR's premises arefalsified by Greenberger-Horne-Zeilinger (GHZ) and Bell experiments. In thispaper, we present an EPR argument based on premises not falsifiable by theseexperiments. We propose macroscopic EPR and GHZ experiments using spins$S_\theta$ defined by two macroscopically distinct states. The analyzers thatrealize the unitary operations $U_\theta$ determining the measurement settings$\theta$ are devices that create macroscopic superposition states. For a systemwith two macroscopically distinct states available, macroscopic realism (MR)posits a predetermined outcome for a measurement $S_\theta$ distinguishingbetween the states. Deterministic macroscopic realism (dMR) posits MR for thesystem prior to the interaction $U_\theta$. Weak macroscopic realism (wMR)posits MR for the system after $U_\theta$, at the time $t_f$ (when the systemis prepared for a final "pointer" measurement), the outcome of $S_\theta$ notbeing changed by interactions that might occur at a remote system $B$. Thepremise also posits that if the outcome for $S_\theta^A$ of a system $A$ can bepredicted by a pointer measurement on a system $B$ defined after theinteraction fixing the setting at $B$, then the outcome for $S_\theta^A$ isdetermined at this time. The GHZ predictions negate dMR but are consistent withwMR. Yet, an EPR paradox arises based on wMR for the set-up proposed bySchr\"odinger, where one measures two complementary spins simultaneously, "oneby direct, the other by indirect" measurement. We revisit the original EPRparadox and find similarly that an EPR argument can be based on a weak form oflocal realism not falsifiable by GHZ or Bell tests.

An Einstein-Podolsky-Rosen argument based on weak forms of local realism not falsifiable by GHZ or Bell experiments