5 papers
Observing Massive Scattering from Null Infinity
Walker Melton, Kyrill Michaelsen, Romain Ruzziconi
Because massive particles asymptote to timelike rather than null infinity, current flat space holographic proposals such as celestial or Carrollian holography struggle to describe…
Flat Space Physics from AdS Actions
Walker Melton
Flat spacetimes are foliated by hyperbolic slices that are geometrically three-dimensional de Sitter or anti-de Sitter spaces. As such, it is possible to construct flat space holog…
Conformal Field Theory with Periodic Time
Walker Melton, Andrew Strominger
It is shown that time-ordered correlation functions of a unitary CFT in 2D Minkowski space admit a single-valued, conformally-invariant extension to the Lorentzian signature to…
Quantum Fields on Time-Periodic AdS
Walker Melton, Andrew Strominger, Tianli Wang
We consider a free complex massive scalar on the quotient spacetime AdS, which has the isometry group SO(2,2) rather than its universal cover. This problem is of int…
No-Boundary State for Klein Space
Walker Melton, Atul Sharma, Andrew Strominger +1
Analytic continuation from signature Minkowski to signature Klein space has emerged as a useful tool for the understanding of scattering amplitudes and flat space h…