[Theory-seminars] Fw: Particle Physics Seminar June 9, 3 pm - "Ultrarelativistic objects in non-local infinite-derivative gravity" - Jens Boos, University of Alberta

[Mary Fox]

________________________________
From: Wilkinson, Ellie V <evwilk at wm.edu>
Sent: Monday, June 1, 2020 4:29 PM
To: physics2017 at physics.wm.edu <physics2017 at physics.wm.edu>
Subject: [EXTERNAL] Particle Physics Seminar June 9, 3 pm - "Ultrarelativistic objects in non-local infinite-derivative gravity" - Jens Boos, University of Alberta

Particle Physics Seminar

Tuesday, June 9, 3pm
Zoom link: https://cwm.zoom.us/j/94601121163<https://urldefense.proofpoint.com/v2/url?u=https-3A__cwm.zoom.us_j_94601121163&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=NXc6ETf15Ad2OT-P0W4YLg&m=2ehgDgIrpDNA4xIOHodvloKdjbQseKXNKRg2N0JtQcU&s=RaJv8OHdcZCfCw-buJhAOuB0ww3jecoXOixKiQyK5jo&e=>

Speaker: Jens Boos, University of Alberta

Title: Ultrarelativistic objects in non-local infinite-derivative gravity

Abstract: Einstein's General Theory of Relativity (GR) has proven a remarkably accurate description of gravitation at the very large scales. At small scales and high energy densities, however, GR is plagued by singularities: these are regions of space and time where the spacetime curvature diverges, hence depriving GR of its predictive power. It is believed that a suitable UV completion of classical gravity will solve that problem, a task that has proven difficult if treated at the full quantum level.

I will present a classical, Lorentz-invariant, but non-local modification of General Relativity that becomes important at a small length scale L. Treated at the linear level the presence of non-locality indeed resolves the singularity problem. However, one may ask whether it is justified to take these linear results seriously. In this talk I will explain one argument in favor:

It has long been shown that the linearized gravitational field of a particle of mass m, when boosted to the speed of light in a suitable limit, describes an exact solution of Einstein's NON-linear field equations. In this talk I will derive the gravitational field of an ultrarelativistic object for non-local gravity in a similar fashion, with the hope that it may also solve the non-linear equations (but that still remains to be shown). If time permits I will comment on interesting consequences for mini-black hole formation.

Based on: Jens Boos, Jose Pinedo Soto, and Valeri P. Frolov, "Ultrarelativistic spinning objects (gyratons) in non-local ghost-free gravity," arXiv:2004.07420 [gr-qc].

Thanks,
Ellie Wilkinson
W&M Physics
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