Speaker
Description
We attempt to reformulate the problem of the microscopic friction force exerted on a bubble wall, focusing on strongly interacting plasmas. Across the confinement transition, the loss of a quasiparticle description renders a conventional kinetic theory approach challenging, so that assuming local thermal equilibrium (LTE) can provide an upper bound on the wall velocity by neglecting the additional friction from out-of-equilibrium effects. In this talk, we suggest a hydrodynamic framework for computing the friction force exerted on the bubble wall, grounded in viscous hydrodynamics, circumventing microphysical scattering calculations. We demonstrate the utility of this approach by applying it to a secluded pure SU(N) Yang-Mills sector undergoing the confinement FOPT, obtaining self-consistent estimates of the terminal bubble wall velocity.