| Celestial amplitudes from flat space limits of AdS/Witten diagrams |
| Ana-Maria Raclariu, University of Amsterdam, Institute of Physics |
| Event Type: Other |
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| Time: 2:00 PM - 3:00 PM |
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| Location: 726 Broadway, 940, CCPP Seminar |
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| Abstract: 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. Link to the Event Video |