(2024-01-16) Seminar: Alexander Zhiboedov -- Black hole bulk-cone singularities


Alexander Zhiboedov  研究员学术报告

Title: Black hole bulk-cone singularities

Speaker: Alexander Zhiboedov

Affiliation: CERN, Switzerland (欧洲核子研究中心)

Time: 16:00-17:00, Tuesday, 16th January, 2024 (UTC+8, Beijing Time)

Venue: Zoom Meeting (ID: 385 442 0225; Passcode: yauc)

Inviter: Yunfeng Jiang(江云峰)


Lorentzian correlators of local operators exhibit surprising singularities in theories with gravity duals. These are associated with null geodesics in an emergent bulk geometry. I will talk about singularities of the thermal response function dual to propagation of waves on the AdS Schwarzschild black hole background. I will present the analytic form of the leading singularity dual to a bulk geodesic that winds around the black hole. Remarkably, it exhibits a boundary group velocity larger than the speed of light, whose dual is the angular velocity of null geodesics at the photon sphere. The strength of this singularity is controlled by the classical Lyapunov exponent associated with the instability of nearly bound photon orbits.


Dr. Alexander Zhiboedov is currently a researcher at the Department of Theoretical Physics of CERN, Switzerland. His research interests include Gravity, Mathematical Physics, QCD, Quantum Field Theory and String Theory.


The seminar will be broadcasted online by Zoom.

Interested people are free to join, without registration in advance.

The Zoom info is


Meeting ID: 385 442 0225

Passcode: yauc