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SUMMARY:Numerical UV Completion of Galileon models - Mary Gerhardinger (Un
 iversity of Pennsylvania)
DTSTART:20251205T130000Z
DTEND:20251205T140000Z
UID:TALK240709@talks.cam.ac.uk
CONTACT:Daniela Cors
DESCRIPTION:Galileon theories provide a useful testing ground for understa
 nding Effective Field Theories (EFTs)\, both as modified-gravity models an
 d as particle theories with nontrivial higher-derivative interactions. The
 se higher-derivative terms are essential for ensuring local scale screenin
 g\, but they also render these theories not technically well-posed.  This 
 is not an issue when treating them as valid EFTs\, however\, it becomes a 
 major issue when numerically simulating their dynamics: the nonlinear evol
 ution of Galileons excites high-frequency modes that rapidly destabilize t
 he computation. I will present three methods we developed to regulate thes
 e high-k modes and enable stable evolution of Galileon dynamics. I will co
 mpare the performance and limitations of each approach\, and show the firs
 t fully nonlinear simulations of the quartic Galileon.
LOCATION:Potter Room / Zoom :  https://cam-ac-uk.zoom.us/j/85131795570
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