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How weak values illuminate the role of “hidden” variables as predictive tools

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In this chapter we offer an introduction to weak values from a three-fold perspective: first, outlining the protocols that enable their experimental determination; next, deriving their correlates in the quantum formalism and, finally, discussing their ontological significance according to different quantum theories or interpretations. We argue that weak values have predictive power and provide novel ways to characterise quantum systems. We show that this holds true regardless of ongoing ontological disputes. And, still, we contend that certain “hidden” variables theories like Bohmian mechanics constitute very valuable heuristic tools for identifying informative weak values or functions thereof. To illustrate these points, we present a case study concerning quantum thermalization. We show that certain weak values, singled out by Bohmian mechanics as physically relevant, play a crucial role in elucidating the thermalization time of certain systems, whereas standard expectation values are “blind” to the onset of thermalization.

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Versió postprint del capítol de llibre publicat a: 
https://doi.org/10.48550/arXiv.2310.03852

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Capítol del llibre: Oianguren-Asua, X.; Solé, A.; Destefani, C. F.; Oriols, X. (2025). "How weak values illuminate the role of “hidden” variables as predictive tools". Guiding Waves in Quantum Mechanics: One Hundred Years of de Broglie-Bohm Pilot-Wave Theory. Volum editat per Andrea Oldofredi. Editorial: Oxford University Press (Oxford, Anglaterra), pp.315 – 335. ISBN: 9780198901853

# metadata.dc.rights[].value
cc by (c) Oianguren-Asua, Xabier et al., 2025

# metadata.dc.source[].value
Llibres / Capítols de llibre (Filosofia)

# metadata.dc.title[].value
How weak values illuminate the role of “hidden” variables as predictive tools