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arXiv · 2610.38690

Quantum Observables of Nonperturbative Superradiant Scattering

Asimina Arvanitaki·Savas Dimopoulos·Marios Galanis·Derek J. Li
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Abstract

Inelastic scattering from $N$ coherent spins, or any two-state system, scales as $N^2$, invalidating the Born approximation at large $N$ even at weak coupling. We develop a nonperturbative theory of this superradiant scattering and its backreaction on the spins. Since one particle can exchange many quanta, the target's energy-transfer and energy-variance rates keep their favorable $N^2$ scaling even after the cross section saturates, unless a conservation law limits each encounter to exchange of one quantum. We apply the theory to millicharged-particle searches, as well as neutron and charged-particle beams that can test quantum protocols for detecting cosmic relics.

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Asimina Arvanitaki, Savas Dimopoulos, Marios Galanis, Derek J. Li. 2026-10-28. Quantum Observables of Nonperturbative Superradiant Scattering. https://arxiv.org/abs/2610.38690

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