Large boson occupation numbers alone do not ensure classical field behavior; proximity to a large-occupation coherent state is required.
Duration of classicality in highly degenerate interacting Bosonic systems
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abstract
We study sets of oscillators that have high quantum occupancy and that interact by exchanging quanta. It is shown by analytical arguments and numerical simulation that such systems obey classical equations of motion only on time scales of order their relaxation time $\tau$ and not longer than that. The results are relevant to the cosmology of axions and axion-like particles.
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quant-ph 1years
2026 1verdicts
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Identical Bosons, large occupation numbers and classical field description
Large boson occupation numbers alone do not ensure classical field behavior; proximity to a large-occupation coherent state is required.