2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/193374The idea that the parton system created in relativistic heavy-ion collisions (i) emerges in a state with transverse momenta close to thermodynamic equilibrium and (ii) its evolution at early times is dominated by the 2-dimensional (transverse) hydrodynamics of the ideal fluid is investigated. It is argued that this mechanism may help to solve the problem of early equilibration.shorter version accepted by Physics Letters BNuclear TheoryHigh Energy Physics - PhenomenologyNuclear Experimenttext