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Theory Seminar: "SuperPlanckian Scattering in Classical and Quantum Gravity" with Ira Rothstein (Carnegie Mellon University)

April 2, 2025
2:10 PM - 3:10 PM
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Theory Center (Pupin 8th Floor)

While quantum gravity as an effective field theory is well understood when all invariants are small compared to the Planck scale, the Regge region (large s small t) still lacks a theoretical underpinning. Moreover, in the limit where s is much larger than the Planck scale  it would seem the theory breaks down. However,  we should surely be able to maintain calculational control, as classical planetary trajectories fall into this class. This is opposed to YM theory where there is no sharp distinction between classical and quantum contributions. I will introduce an effective field theory of gravity which systematizes the Regge limit and allows us to calculate in a double quantum/classical expansion. I will demonstrate how this formalism can be used to calculate the graviton Regge trajectory, the gravitational BFKL equation and to make predictions for higher order corrections to gravitational wave signatures from binary inspirals.