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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Wilkinson, Ellie V <evwilk@wm.edu><br>
<b>Sent:</b> Monday, June 1, 2020 4:29 PM<br>
<b>To:</b> physics2017@physics.wm.edu <physics2017@physics.wm.edu><br>
<b>Subject:</b> [EXTERNAL] Particle Physics Seminar June 9, 3 pm - "Ultrarelativistic objects in non-local infinite-derivative gravity" - Jens Boos, University of Alberta</font>
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<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><b>Particle Physics Seminar</b></span><br>
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Tuesday, June 9, 3pm</div>
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Zoom link: <a href="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=" id="LPlnk432348">https://cwm.zoom.us/j/94601121163</a><br>
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<b>Speaker: Jens Boos, University of Alberta</b></div>
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<b><span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">Title:</span><span style="color:rgb(50,49,48); font-size:15px; background-color:rgb(255,255,255); display:inline!important"><span style="font-size:12pt"> </span></span><span style="font-size:12pt"><u style="color:rgb(50,49,48)">Ultrarelativistic
objects in non-local infinite-derivative gravity</u></span></b><br style="color:rgb(50,49,48); font-size:15px">
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<span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important"><b>Abstract:</b> 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.</span><br style="color:rgb(50,49,48); font-size:15px">
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<span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">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:</span><br style="color:rgb(50,49,48); font-size:15px">
<br style="color:rgb(50,49,48); font-size:15px">
<span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">It has long been shown that the linearized gravitational field of a particle of mass m, when</span><span style="color:rgb(50,49,48); font-size:15px; background-color:rgb(255,255,255); display:inline!important"><span style="font-size:12pt"> </span></span><span style="margin:0px; font-size:12pt; color:rgb(50,49,48)">boos</span><span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">ted
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.</span><br style="color:rgb(50,49,48); font-size:15px">
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<span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">Based on:</span><span style="color:rgb(50,49,48); font-size:15px; background-color:rgb(255,255,255); display:inline!important"><span style="font-size:12pt"> </span></span><span style="margin:0px; font-size:12pt; color:rgb(50,49,48)">Jens</span><span style="color:rgb(50,49,48); font-size:15px; background-color:rgb(255,255,255); display:inline!important"><span style="font-size:12pt"> </span></span><span style="margin:0px; font-size:12pt; color:rgb(50,49,48)">Boos</span><span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">,
Jose Pinedo Soto, and Valeri P. Frolov, "Ultrarelativistic spinning objects (gyratons) in non-local ghost-free gravity," arXiv:2004.07420 [gr-qc].</span><br>
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<span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">Thanks,</span></div>
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<span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">Ellie Wilkinson</span></div>
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<span style="color:rgb(50,49,48); font-size:12pt; background-color:rgb(255,255,255); display:inline!important">W&M Physics</span></div>
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