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Self-stimulated avalanche in superradiant axion clouds
Abstract
Boson clouds formed via superradiance around spinning black holes offer a novel probe of ultralight particles. We show that such gravitational atoms can undergo a self-stimulated avalanche: a coherent quadrupolar transition is seeded by external gravitational waves and amplified by self-generated radiation feedback. We formulate an effective two-level description that captures the logistic population transfer and the resulting delayed gravitational-wave pulse with a characteristic envelope. This cooperative emission mechanism opens a new observational avenue into the ultralight dark sector.
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BibTeX
@misc{lyu2026selfstimulated,
title = {{Self-stimulated avalanche in superradiant axion clouds}},
author = {Zhen-Hong Lyu and Rong-Gen Cai and Jing Liu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.10776},
eprint = {2606.10776},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.10776},
}
RIS
TY - UNPB
TI - Self-stimulated avalanche in superradiant axion clouds
AU - Zhen-Hong Lyu
AU - Rong-Gen Cai
AU - Jing Liu
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2606.10776
UR - https://arxiv.org/abs/2606.10776
AB - Boson clouds formed via superradiance around spinning black holes offer a novel probe of ultralight particles. We show that such gravitational atoms can undergo a self-stimulated avalanche: a coherent quadrupolar transition is seeded by external gravitational waves and amplified by self-generated radiation feedback. We formulate an effective two-level description that captures the logistic population transfer and the resulting delayed gravitational-wave pulse with a characteristic envelope. This cooperative emission mechanism opens a new observational avenue into the ultralight dark sector.
ER -