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SUMMARY:Towards an all-orders calculation of the electroweak bubble wall v
 elocity - Jessica Turner (IPPP\, Durham)
DTSTART:20210429T150000Z
DTEND:20210429T160000Z
UID:TALK159784@talks.cam.ac.uk
CONTACT:Joseph Davighi
DESCRIPTION:*The seminar will take place via Zoom "here":https://maths-cam
 -ac-uk.zoom.us/j/95215212460?pwd=TWN5cjJ3azErSUYremw5UWRKL0NKUT09.*\n\nAbs
 tract: In this talk I discuss recent work where we calculate the velocity 
 of the Higgs condensate bubble wall during a first-order electroweak phase
  transition in the early Universe. The interaction of particles with the b
 ubble wall can be accompanied by the emission of multiple soft gauge boson
 s. When computed at fixed order in perturbation theory\, this process exhi
 bits large logarithmic enhancements which must be resummed to all orders w
 hen the wall velocity is large. We perform this resummation both analytica
 lly and numerically at leading logarithmic accuracy. The numerical simulat
 ion is achieved by means of a particle shower in the broken phase of the e
 lectroweak theory. The two approaches agree to the 10% level. For fast-mov
 ing walls\, we find the scaling of the thermal pressure exerted against th
 e wall to be P~γ^2T4\, independent of the particle masses\, implying a si
 gnificantly slower terminal velocity than previously suggested. This is im
 pactful for baryogenesis\, gravitational wave radiation and generation of 
 other cosmic relics.\n\nThe slides are available "here":https://www.hep.ph
 y.cam.ac.uk/~conference/Turner-2021-04-29.pdf\n\n
LOCATION:Virtual Seminar 
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