Duration of classicality in highly degenerate interacting Bosonic systems

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.

arXiv comment5 pages, 3 figures

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• Quantum signatures in nonlinear gravitational waves
• Boson stars and their relatives in semiclassical gravity
• Gravitational self-interactions of a degenerate quantum scalar field
• Squeezing the Axion
• On the single classical field description of interacting scalar fields
• Nonclassicality of axion-like dark matter through gravitational self-interactions
• When quantum corrections alter the predictions of classical field theory for scalar field dark matter
• Density perturbations in axion-like particles: classical vs quantum field treatment
• Duration of Classicality of an inhomogeneous quantum field with repulsive contact self-interactions
• Field moment expansion method for interacting Bosonic systems