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Determinations of the shear viscosity of trapped ultracold gases suffer from systematic, uncontrolled uncertainties related to the treatment of the dilute part of the gas cloud. In this work we present an analysis of expansion experiments based on a new method, anisotropic fluid dynamics, that interpolates between Navier-Stokes fluid dynamics at the center… (More)

- M. Bluhm, B. Kämpfer, R. Schulze, D. Seipt
- 2009

Within a phenomenological quasiparticle model, the quark mass and temperature dependence of the QCD equation of state is discussed and compared with lattice QCD results. Different approximations for the quasiparticle dispersion relations are employed, scaling properties of the equation of state with quark mass and deconfinement temperature are investigated… (More)

- M. Bluhm
- 2006

We confront our quasi-particle model for the equation of state of strongly interacting matter with recent first-principle QCD calculations. In particular, we test its applicability at finite baryon densities by comparing with Taylor expansion coefficients of the pressure for two quark flavours. We outline a chain of approximations starting from the… (More)

The equation of state (EoS) of strongly interacting matter contains important information about bulk properties and the thermodynamics. In fact, one needs the EoS as input for describing hydrodynamically the evolution of the early universe, dynamics and static characteristics of neutron stars as well as certain stages of relativistic heavy-ion collisions.… (More)

- M Bluhm, J Schwimmer
- Zeitschrift für medizinische…
- 1986

We present a description of the equation of state of strongly interacting matter within a quasi-particle model. The model is adjusted to lattice QCD data near the deconfinement temperature Tc. We compare in detail the excess pressure at nonvanishing chemical potential and its expansion coefficients with two-flavor lattice QCD calculations and outline… (More)

Within a quasi-particle model for the equation of state of strongly interacting matter for two quark flavors we include phenomenologically features of the QCD critical point and discuss its impact on the equation of state. In particular, we investigate the influence on the quark number susceptibility and the pattern of isentropic trajectories which describe… (More)

- Marcus Bluhm, Gerhard Soff
- 2004

The successful quasi-particle model is compared with recent lattice data of the coefficients in the Taylor series expansion of the excess pressure at finite temperature and baryon density. A chain of approximations, starting from QCD to arrive at the model expressions for the entropy density, is presented.

We present a description of the equation of state of strongly interacting matter within a quasi-particle model. The model is adjusted to lattice QCD data near the deconfinement temperature T0. We compare in detail the excess pressure and its expansion coefficients available from two-flavor lattice QCD calculations and outline prospects of the extrapolation… (More)

A phenomenological quasiparticle model, featuring dynamically generated self-energies of excitation modes, successfully describes lattice QCD results relevant for the QCD equation of state and related quantities both at zero and non-zero net baryon density. Here, this model is extended to study bulk and shear viscosities of the gluon-plasma within an… (More)