Dr Urs Wiedemann - "Fluid dynamics of the little bangs (heavy ion collisions) and the Big Bang"

par Dr Urs Wiedemann

vendredi 30 sept. 2016, 10:45 → 12:45 Europe/Paris

Salle Mondrian (IPHC, bât. 25)

Relativistic viscous fluid dynamics is at the basis of the phenomenology of soft particle production in heavy ion collisions and it is used to understand cosmological large-scale structure formation in the early universe. In “textbook” fluid dynamics, the long-wavelength properties of a physical system are described via a gradient expansion around local thermal equilibrium. In this talk, I review the current understanding of the applicability of relativistic viscous fluid dynamics to problems in heavy ion collisions and large scale structure formation, where the notion local thermal equilibrium cannot be taken for granted. In the case of little bang physics, I explain recent progress on equilibration and I discuss the phenomenon of “hydrodynamization without thermalization”. In the case of big bang physics, I explain how an effective viscous fluid dynamic description can become meaningful in a system in which no equilibration mechanisms exist. For both cases, I discuss phenomenological applications of fluid dynamics and I point to their limitations and open challenges.

Transparents SeminaireIPHC-UrsWiedemann-2016-Sept-30-Hydro+Cosmo.ppt