Bosonic and Fermionic love number of static acoustic black hole
Abstract
We compute static () tilde Love numbers for scalar () and Dirac () 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 . In (2+1) dimensions the scalar field exhibits a strange logarithmic structure, causing the Bosonic Love number to vanish for even but remain nontrivial for odd ; In contrast, the Fermionic Love number in this case retains a simple power-law form 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.
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}
}
Comments
12 pages