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References
M. Drees: Particle physics explanations for ultra high energy cosmic ray events, invited plenary talk at PASCOS03, Mumbai, India, January 2003. Los Alamos archives hep-ph/0304030 (2003).
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The allusion is to Penrose’s hypothesis that quantum superpositions remain as long as the difference in the spacetime manifold, entailed by the different mass configurations, is kept below some threshold value. Above that limit, he proposed, some nonlinear dynamics, emanating from an as yet unknown theory of quantum gravity, will cause a collapse. See, e.g., R. Penrose: Non-locality and objectivity in quantum state reduction. In: Fundamental Aspects of Quantum Theory, ed. by J. Anandan and J.L. Safko, World Scientific, Singapore (1994).
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The speaker refers here to a useful term coined by J.S. Bell in his Speakable and Unspeakable in Quantum Mechanics (Cambridge University Press, 1987), where he distinguished between ‘beables’ and ‘speakables’.
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(2005). Roundtable Discussion II: Quantum Mechanics and its Limits. In: Elitzur, A.C., Dolev, S., Kolenda, N. (eds) Quo Vadis Quantum Mechanics?. The Frontiers Collection. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-26669-0_14
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