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Search: authors:"Stefan Floerchinger"

8 papers found.
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Variational principle for theories with dissipation from analytic continuation

The analytic continuation from the Euclidean domain to real space of the one-particle irreducible quantum effective action is discussed in the context of generalized local equilibrium states. Discontinuous terms associated with dissipative behavior are parametrized in terms of a conveniently defined sign operator. A generalized variational principle is then formulated, which...

Hydrodynamics and jets in dialogue

Stefan Floerchinger 0 Korinna C. Zapp 0 0 CERN, Theory Unit , Geneva , Switzerland Energy and momentum loss of jets in heavy ion collisions can affect the fluid dynamic evolution of the medium. We

Isotropization from color field condensate in heavy ion collisions

Stefan Floerchinger 1 Christof Wetterich 0 0 Institut fur Theoretische Physik , Philosophenweg 16, 69120 Heidelberg, Germany 1 Physics Department, Theory Unit , CERN, CH-1211 Gen`eve 23

Statistics of initial density perturbations in heavy ion collisions and their fluid dynamic response

An interesting opportunity to determine thermodynamic and transport properties in more detail is to identify generic statistical properties of initial density perturbations. Here we study event-by-event fluctuations in terms of correlation functions for two models that can be solved analytically. The first assumes Gaussian fluctuations around a distribution that is fixed by the...

Analytic continuation of functional renormalization group equations

Stefan Floerchinger 0 0 Physics Department, Theory Unit , CERN, CH-1211 Geneve 23, Switzerland Functional renormalization group equations are analytically continued from imaginary Matsubara

Fluctuations around Bjorken flow and the onset of turbulent phenomena

We study how fluctuations in fluid dynamic fields can be dissipated or amplified within the characteristic spatio-temporal structure of a heavy ion collision. The initial conditions for a fluid dynamic evolution of heavy ion collisions may contain significant fluctuations in all fluid dynamical fields, including the velocity field and its vorticity components. We formulate and...

Functional renormalization for the Bardeen–Cooper–Schrieffer to Bose–Einstein condensation crossover

We review the functional renormalization group (RG) approach to the Bardeen–Cooper–Schrieffer to Bose–Einstein condensation (BCS–BEC) crossover for an ultracold gas of fermionic atoms. Formulated in terms of a scale-dependent effective action, the functional RG interpolates continuously between the atomic or molecular microphysics and the macroscopic physics on large length...