374 citations · 1.8k across the 21 of their papers we have counts for
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Photon Rings Around Warped Black Holes
Daniel Kapec, Alexandru Lupsasca, Andrew Strominger
The black hole photon ring is a prime target for upcoming space-based VLBI missions seeking to image the fine structure of astrophysical black holes. The classical Lyapunov exponen…
Integrable Field Theories and Their CCFT Duals
Daniel Kapec, Adam Tropper
We compute the Mellin transforms of various two-dimensional integrable -matrices, providing the first explicit, non-perturbative realizations of celestial CFT. In two dimensions…
Soft Particles and Infinite-Dimensional Geometry
Daniel Kapec
In the sigma model, soft insertions of moduli scalars enact parallel transport of -matrix elements about the finite-dimensional moduli space of vacua, and the antisymmetric doub…
Soft Scalars and the Geometry of the Space of Celestial CFTs
Daniel Kapec, Y. T. Albert Law, Sruthi A. Narayanan
Known examples of the holographic dictionary in asymptotically Anti-de Sitter spacetimes equate moduli spaces of bulk vacua with conformal manifolds in the dual quantum field theor…
Holography of the Photon Ring
Shahar Hadar, Daniel Kapec, Alexandru Lupsasca +1
Space-based next-generation interferometers propose to measure the Lyapunov exponents of the nearly bound geodesics that comprise the photon ring surrounding the black hole M87*. W…