Celestial Symmetries of Black Hole Horizons

Speaker: Céline Zwikel (College de France)

Time: 2025-10-30 15:00-16:00
Location: 1510, SIMIS
Zoom Meeting ID:836 6149 2372 Passcode:SIMIS

Abstract: I will present a novel correspondence between the gravitational phase space at null infinity and the subleading phase space for finite-distance null hypersurfaces, such as black hole horizons. Using Newman-Penrose formalism and an off-shell Weyl transformation, this construction transfers key structures from asymptotic boundaries to null surfaces in the bulk—for instance, a notion of radiation. Imposing self-duality conditions, I will identify the celestial symmetries and construct their canonical generators for finite-distance null hypersurfaces. This framework provides new observables for black hole physics.

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About Speaker: Céline Zwikel is a PostDoc at College de France. She got her Ph.D from Brussels University in 2018. Then she was a Postdoc at Vienna University of Technology and Perimeter Inst. Theor. Phys. Her research focuses on classical and quantum gravity, holography and symmetries in gauge theories