PreprintarXiv licencearXiv
Quantum Observables of Nonperturbative Superradiant Scattering
Abstract
Inelastic scattering from N coherent spins, or any two-state system, scales as N2, 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 N2 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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BibTeX
@misc{arvanitaki2026quantum,
title = {{Quantum Observables of Nonperturbative Superradiant Scattering}},
author = {Asimina Arvanitaki and Savas Dimopoulos and Marios Galanis and Derek J. Li},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38690},
eprint = {2610.38690},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38690},
}
RIS
TY - UNPB
TI - Quantum Observables of Nonperturbative Superradiant Scattering
AU - Asimina Arvanitaki
AU - Savas Dimopoulos
AU - Marios Galanis
AU - Derek J. Li
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.38690
UR - https://arxiv.org/abs/2610.38690
AB - 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.
ER -