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PreprintCC BY 4.0arXiv

Amplified EFT corrections near exceptional QNMs

  • William L. Boyce
  • Jorge E. Santos
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Abstract

We show that the ordinary expansion of EFT corrections to individual QNM frequencies breaks down at an exceptional QNM, and that these corrections become enhanced for near-exceptional QNMs. We give a brief argument for why this should generally happen, before numerically demonstrating this behaviour by calculating the α'3 corrections to QNMs of equal-spin Myers--Perry-AdS5 black holes. This calculation corresponds to λ−3/2 corrections to the poles of the retarded Green's function in the boundary CFT, where λ is the 't Hooft coupling. Treating the coalescing pair together, we calculate the leading λ−3/4 splitting at the uncorrected exceptional point and the λ−3/2 displacement of the exceptional point in temperature and angular velocity. The background derivative expansion can remain valid while the nondegenerate expansion of individual frequencies fails. We discuss the implications for the full response and for other areas of black hole physics.

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Cite

BibTeXRIS
BibTeX
@misc{boyce2026amplified,
  title = {{Amplified EFT corrections near exceptional QNMs}},
  author = {William L. Boyce and Jorge E. Santos},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.30311},
  eprint = {2610.30311},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.30311},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Amplified EFT corrections near exceptional QNMs
AU  - William L. Boyce
AU  - Jorge E. Santos
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2610.30311
UR  - https://arxiv.org/abs/2610.30311
AB  - We show that the ordinary expansion of EFT corrections to individual QNM frequencies breaks down at an exceptional QNM, and that these corrections become enhanced for near-exceptional QNMs. We give a brief argument for why this should generally happen, before numerically demonstrating this behaviour by calculating the α'^3 corrections to QNMs of equal-spin Myers--Perry-AdS_5 black holes. This calculation corresponds to λ^−3/2 corrections to the poles of the retarded Green's function in the boundary CFT, where λ is the 't Hooft coupling. Treating the coalescing pair together, we calculate the leading λ^−3/4 splitting at the uncorrected exceptional point and the λ^−3/2 displacement of the exceptional point in temperature and angular velocity. The background derivative expansion can remain valid while the nondegenerate expansion of individual frequencies fails. We discuss the implications for the full response and for other areas of black hole physics.
ER  -