4 papers
Single-minus graviton tree amplitudes are nonzero
Alfredo Guevara, Alexandru Lupsasca, David Skinner +2
Single-minus tree-level -graviton scattering amplitudes are revisited. Often presumed to vanish, they are shown here to be nonvanishing for certain "half-collinear" configuratio…
Celestial Quantum Error Correction I: Qubits from Noncommutative Klein Space
Alfredo Guevara, Yangrui Hu
Quantum gravity in 4D asymptotically flat spacetimes features spontaneous symmetry breaking due to soft radiation hair, intimately tied to the proliferation of IR divergences. A ho…
Celestial Quantum Error Correction II: From Qudits to Celestial CFT
Alfredo Guevara, Yangrui Hu
A holographic CFT description of asymptotically flat spacetimes inherits vacuum degeneracies and IR divergences from its gravitational dual. We devise a Quantum Error Correcting (Q…
Multiparticle Contributions to the Celestial OPE
Alfredo Guevara, Yangrui Hu, Sabrina Pasterski
We start by defining two-particle operators that appear in celestial CFT. We then show how to compute their OPE coefficients with the known single-particle operators at tree level…