Felix Reining
Goethe University Frankfurt
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Featured researches published by Felix Reining.
Physical Review C | 2011
Christian Wesp; Andrej El; Felix Reining; Zhe Xu; Ioannis Bouras; Carsten Greiner
The shear viscosity of a gluon gas is calculated using the Green-Kubo relation. Time correlations of the energy-momentum tensor in thermal equilibrium are extracted from microscopic simulations using a parton cascade solving various Boltzmann collision processes. We nd that the pQCD based gluon bremsstrahlung described by Gunion-Bertsch processes signicantly lowers the shear viscosity by a factor of 3 8 compared to elastic scatterings. The shear viscosity scales with the coupling as 1=( 2 log(1= s)). For constant s the shear viscosity to entropy density ratio =s has no dependence on temperature. Replacing the pQCD-based collision angle distribution of binary scatterings by an isotropic form decreases the shear viscosity by a factor of 3.
Physical Review E | 2013
Moritz Greif; Felix Reining; Ioannis Bouras; G. S. Denicol; Zhangbu Xu; Carsten Greiner
Motivated by the classical picture of heat flow we construct a stationary temperature gradient in a relativistic microscopic transport model. Employing the relativistic Navier-Stokes ansatz we extract the heat conductivity κ for a massless Boltzmann gas using only binary collisions with isotropic cross sections. We compare the numerical results to analytical expressions from different theories and discuss the final results. The directly extracted value for the heat conductivity can be referred to as a literature reference within the numerical uncertainties.
Physical Review E | 2012
Felix Reining; Ioannis Bouras; Andrej El; Chistian Wesp; Zhe Xu; Carsten Greiner
Starting from a classical picture of shear viscosity we construct a stationary velocity gradient in a microscopic parton cascade. Employing the Navier-Stokes ansatz we extract the shear viscosity coefficient η. For elastic isotropic scatterings we find an excellent agreement with the analytic values. This confirms the applicability of this method. Furthermore, for both elastic and inelastic scatterings with pQCD based cross sections we extract the shear viscosity coefficient η for a pure gluonic system and find a good agreement with already published calculations.
arXiv: High Energy Physics - Phenomenology | 2011
Ioannis Bouras; Andrej El; Oliver Fochler; Francesco Lauciello; Felix Reining; Jan Uphoff; Christian Wesp; E. Molnar; Harri Niemi; Zhe Xu; Carsten Greiner
Employing a microscopic transport model we investigate the evolution of high energetic jets moving through a viscous medium. For the scenario of an unstoppable jet we observe a clearly strong collective behavior for a low dissipative system η/s ≈ 0.005, leading to the observation of cone-like structures. Increasing the dissipation of the system to η/s ≈ 0.32 the Mach Cone structure vanishes. Furthermore, we investigate jet-associated particle correlations. A double-peak structure, as observed in experimental data, is even for low-dissipative systems not supported, because of the large influence of the head shock.
arXiv: High Energy Physics - Phenomenology | 2011
Ioannis Bouras; Andrej El; Oliver Fochler; Felix Reining; Jan Uphoff; Christian Wesp; Zhe Xu; Carsten Greiner
Fast thermalization and a strong build up of elliptic flow of QCD matter were investigated within the pQCD based 3+1 dimensional parton transport model BAMPS including bremsstrahlung
Journal of Physics: Conference Series | 2013
Ioannis Bouras; Oliver Fochler; Felix Reining; Florian Senzel; Jan Uphoff; Christian Wesp; Zhangbu Xu; Carsten Greiner
2 \leftrightarrow 3
Journal of Physics: Conference Series | 2012
Ioannis Bouras; Andrej El; Oliver Fochler; Felix Reining; Florian Senzel; Jan Uphoff; Christian Wesp; Zhe Xu; Carsten Greiner
processes. Within the same framework quenching of gluonic jets in Au+Au collisions at RHIC can be understood. The development of conical structure by gluonic jets is investigated in a static box for the regimes of small and large dissipation. Furthermore we demonstrate two different approaches to extract the shear viscosity coefficient
EPJ Web of Conferences | 2014
Ioannis Bouras; Oliver Fochler; Moritz Greif; Felix Reining; Florian Senzel; Jan Uphoff; Christian Wesp; Zhe Xu; Carsten Greiner
\eta
arXiv: High Energy Physics - Phenomenology | 2013
Ioannis Bouras; Andrej El; Oliver Fochler; Felix Reining; Florian Senzel; Jan Uphoff; Christian Wesp; Zhe Xu; Carsten Greiner
from a microscopical picture.
PoS | 2010
Ioannis Bouras; Carsten Greiner; Oliver Fochler; Christian Wesp; Felix Reining; Dirk H. Rischke; Harri Niemi; Andrej El; Francesco Lauciello; E. Molnar; Zhe Xu
We discuss recent applications of the partonic perturbative QCD based cascade model BAMPS with focus on heavy-ion phenomeneology in hard and soft momentum range. First, the elliptic flow and suppression of charm and bottom quarks are studied at LHC energies. Thereafter, we compare in a detailed study the standard Gunion-Bertsch approximation of the matrix elements for inelastic processes to the exact results at leading order perturbative QCD. Since a disagreement is found, we propose an improved Gunion-Bertsch matrix element, which agrees with the exact result in all phase space regions. In addition to recent jet-quenching investigations we present results on the application of jet reconstruction algorithms in BAMPS. Finally, jet phenomena inducing collective effects such as Mach cones, are demonstrated in an expanding medium at relativistic heavy-ion collisions. We address the question, whether the signal of a Mach cones is the origin for a double peak structure in extracted two-particle correlations.