SMuK 2021 – scientific programme

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AGPhil: Arbeitsgruppe Philosophie der Physik

AGPhil 4: Quantum Theory 3

AGPhil 4.3: Talk

Wednesday, September 1, 2021, 15:00–15:30, H8

Temporal global correlations in time symmetric collapse models — •Pascal Rodríguez — Utrecht University

We propose that time symmetric collapse models require the existence of temporal global correlations across histories. We elaborate on a recent discussion regarding whether time-symmetric quantum mechanics requires retrocausality (Price, 2012; Leifer and Pusey 2017), spooky-action-at-temporal-distance (Adlam 2018), or neither of them. The moral is that quantum theories meeting certain assumptions either violate time-symmetry or imply retrocausality. Adlam argues we should give up the assumption that every quantum correlation is λ-mediated, meaning that there is spooky-action-at-temporal-distance. We consider that both proposals are metaphysically strong, although the point needs to be taken seriously. We suggest an analysis of time-symmetric collapse models, in which the wave-function is taken as a temporally asymmetric predictive tool to make the theory Markovian (Bedingham and Maroney 2017). We propose that the model does not require retrocausality since not every correlation is mediated by an ontic state. Nevertheless, we show that it does not need action-at-temporal-distance either; the temporal correlations exhibited violate temporal outcome independence (TOI) across histories. Analogously to the spacelike case, these TOI should not be interpreted as action-at-temporal-distance, but as temporal global correlations. We conclude with remarks about whether these correlations involve violations of Measurement Independence in an EPRB-scenario.