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Day 27 - fire sprites

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Nevertheless, perhaps unjustifiably, Bohm's approach has never caught on.¹³

13. The Bohm or de Broglie-Bohm approach has never received wide attention. Perhaps one reason for this, as pointed out by John Bell in his article "The Impossible Pilot Wave," collected in Speakable and Unspeakable in Quantum Mechanics, is that neither de Broglie nor Bohm was particularly fond of what he himself had developed. But, again as Bell points out, the de Broglie-Bohm approach does away with much of the vagueness and subjectivity of the more standard approach. If for no other reason, even if the approach is wrong, it is worth knowing that the particles can have definite positions and definite velocities at all times (ones beyond our another, even in principle, to measure), and still conform fully to the predictions of standard quantum mechanics – uncertainty and all. Another argument against Bohm's approach is that the nonlocality in his framework is more "severe" than that of standard quantum mechanics. By this it is meant that Bohm's approach has nonlocal interactions (between the wavefunction and particles) as a central element of the theory from the outset, while in quantum mechanics the nonlocality is more deeply buried and arises only through nonlocal correlations between widely separated measurements. But, as supporters of this approach have argued, because something is hidden does not make it any less present, and, moreover, as the standard approach is vague regarding the quantum measurement problem – the very place where nonlocality makes itself apparent – once that issue is fully resolved, the nonlocality may not be so hidden after all. Others have argued the there are obstacles to making a realistic version of the Bohm approach, although progress has been made on this front as well (see, for example, John Bell Beables for Quantum Field Theory, in the collected volume indicated above). And so, it is definitely worth keeping this alternative approach in mind, even if only as a foil against rash conclusions about what quantum mechanics unavoidably implies.

"The Fabric of the Cosmos" - Brian Greene