Speaker
Description
We compute the canonical (brick-wall) entropy of Hawking radiation in a quantum black hole whose exterior geometry, in the strong field region, is approximated, to first order in a small quadrupole parameter, by the static q-metric, which is an exact vacuum solution of the Einstein equations. Counting near horizon quasinormal modes shows that a modest quadrupolar deformation self-regularizes the ultraviolet divergence: the entropy of Hawking radiation is finite for any non-vanishing quadrupole, without an ad hoc cutoff. Matching this canonical entropy to the Bekenstein-Hawking entropy leads to no-hair violating multipoles, at percent-to-tens-of-percent level, and provides concrete observational targets for the Next Generation Event Horizon Telescope (ngEHT) and the Laser Interferometer Space Antenna (LISA).
| Keyword-1 | entropy |
|---|---|
| Keyword-2 | quadrupole |
| Keyword-3 | no-hair theorem |