Description
Black-hole horizons, the "surfaces of no return", lie at the intersection of general relativity and quantum theory, but they are extremely difficult to probe observationally. In this talk, I will present our analysis of GW250114, the loudest binary black-hole signal observed so far, and report observational evidence for a "direct wave" component associated with the newly formed black-hole horizon. This signal carries imprints linked to two fundamental horizon properties: rotation frequency and surface gravity. The measured properties of this component are consistent with theoretical predictions for a Kerr black hole. The result opens a new observational channel to directly measure frame-dragging effects in black-hole ergospheres and explore near-horizon physics in dynamical, strong-gravity regimes through gravitational waves.
| I am the presenting author | Yes |
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