# Celestial amplitudes from flat space limits of AdS Witten diagrams

### APA

Raclariu, A. (2022). Celestial amplitudes from flat space limits of AdS Witten diagrams. Perimeter Institute. https://pirsa.org/22090075

### MLA

Raclariu, Ana-Maria. Celestial amplitudes from flat space limits of AdS Witten diagrams. Perimeter Institute, Sep. 06, 2022, https://pirsa.org/22090075

### BibTex

@misc{ pirsa_PIRSA:22090075, doi = {10.48660/22090075}, url = {https://pirsa.org/22090075}, author = {Raclariu, Ana-Maria}, keywords = {Quantum Fields and Strings}, language = {en}, title = {Celestial amplitudes from flat space limits of AdS Witten diagrams}, publisher = {Perimeter Institute}, year = {2022}, month = {sep}, note = {PIRSA:22090075 see, \url{https://pirsa.org}} }

**Collection**

**Subject**

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.

Zoom Link: https://pitp.zoom.us/j/97426266597?pwd=UmhncFR6NExFVzI2SlJwdE1LeUlIQT09