How Does 'Collapse' Occur in Bohm Mech.

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In Bohmian mechanics, the wave function does not collapse; instead, each particle maintains a definite position guided by the pilot wave, which corresponds to the wave function in traditional quantum mechanics. The Schrödinger equation governs the pilot wave, but the emergence of definite states remains an experimental fact without a clear explanation. Over time, certain parts of the wave function become irrelevant as they pertain to configurations far from the actual state of the system. These irrelevant components can be disregarded in calculations, effectively mimicking the collapse observed in traditional quantum mechanics. Thus, while Bohmian mechanics avoids wave function collapse, it provides a framework for understanding how definite states can arise.
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How does one obtain a collapse of the wave function in Bohm Mechanics? The pilot wave is guided by the Scrodinger equation - but how do definite states arise?
 
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No body really knows... Its just an experimental fact. Wave functions collapse, and give a result with the appropriate probability.
 
In Bohmian mechanics there is no collapse. Each particle has a definite position guided by the pilot wave, which is essentially the wave function of traditional QM. This wave function never collapses.

However, over time certain parts of the wave function become irrelevant, as they deal with configurations of the system far from the actual, definite configuration. Accordingly the system's actual configuration will never again be affected by these parts of the wave function. If we are doing a calculation we can forget about these parts of the wave function, or set them to zero. Doing so is exactly the same thing as collapsing the wave function in traditional QM.
 

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