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High Energy Theory artwork
August 29, 20222:00 pm – 3:00 pm (CDT)

Celestial Amplitudes from Flat Space Limits of AdS/Witten Diagrams


Ana Raclariu (Perimeter Institute)


Aritra Saha



Mitchell Institute for Fundamental Physics & Astronomy

College Station, Texas 77843

Event Details

The search for pragmatic observables of quantum gravity remains at the forefront of fundamental physics research. A large set of ideas collectively known as the gauge-gravity duality have proven fruitful in tackling this problem. While such a duality is believed to universally govern gravitational theories, its nature in theories of gravity that describe our universe to a good degree of approximation is still little understood.
In this talk I will discuss efforts in formulating a holographic correspondence for gravity in four-dimensional asymptotically flat spacetimes. The proposed dual theory lives on a two-dimensional celestial sphere at infinity and is constrained by a wide range of symmetries. I present recent evidence for this proposal by showing that it arises naturally in a flat space limit of AdS/CFT. I will illustrate this construction with two related examples: the propagation of a particle in a shockwave background and the high-energy scattering of 2 particles.

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