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Bosonic and Fermionic love number of static acoustic black hole

High Energy Physics - Theory 2026-05-04 v1 General Relativity and Quantum Cosmology

Abstract

We compute static (ω0\omega\to0) tilde Love numbers for scalar (s=0s=0) and Dirac (s=1/2s=1/2) perturbations of static acoustic black holes (ABHs) in (3+1) and (2+1) dimensions respectively. By imposing horizon regularity condition and matching to the large-radius expansion, we extract the ratio between decaying and growing modes. It turns out that in (3+1) dimensions the scalar Love number is generically nonzero for ABHs, while the Fermionic Love numbers follow a universal power-law form Fm±1/2=±4(+1/2)F^{\pm1/2}_{\ell m}=\pm 4^{-(\ell+1/2)}. In (2+1) dimensions the scalar field exhibits a strange logarithmic structure, causing the Bosonic Love number to vanish for even mm but remain nontrivial for odd mm; In contrast, the Fermionic Love number in this case retains a simple power-law form Fm=4mF_m=4^{-m} and is generically nonzero. These results provide insights into tidal response in analogue gravity systems and highlight qualitative differences between integer- and half-integer-spin fields.

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Cite

@article{arxiv.2512.23305,
  title  = {Bosonic and Fermionic love number of static acoustic black hole},
  author = {Yongbin Du and Xiangdong Zhang},
  journal= {arXiv preprint arXiv:2512.23305},
  year   = {2026}
}

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12 pages