752 research outputs found
Collective Flow and Mach Cones with Parton Transport
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 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 from a microscopical picture.Comment: 7 pages, 8 figures, 1 table; to appear in the proceedings of Hot and
Cold Baryonic Matter -- HCBM 201
Extraction of shear viscosity in stationary states of relativistic particle systems
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 . 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 for a pure gluonic system and find a good
agreement with already published calculations.Comment: 17 pages, 7 figure
Relativistic shock waves in viscous gluon matter
We solve the relativistic Riemann problem in viscous gluon matter employing a
microscopic parton cascade. We demonstrate the transition from ideal to viscous
shock waves by varying the shear viscosity to entropy density ratio
from zero to infinity. We show that an ratio larger than 0.2 prevents
the development of well-defined shock waves on timescales typical for
ultrarelativistic heavy-ion collisions. Comparisons with viscous hydrodynamic
calculations confirm our findings.Comment: Version as published in PRL 103, 032301 (2009). 4 pages, 4 figure
The impact of vascular burden on late-life depression.
Small vessel pathology and microvascular lesions are no longer considered as minor players in the fields of cognitive impairment and mood regulation. Although frequently found in cognitively intact elders, both neuroimaging and neuropathological data revealed the negative impact on cognitive performances of their presence within neocortical association areas, thalamus and basal ganglia. Unlike cognition, the relationship between these lesions and mood dysregulation is still a matter of intense debate. Early studies focusing on the role of macroinfarct location in the occurrence of post-stroke depression (PSD) led to conflicting data. Later on, the concept of vascular depression proposed a deleterious effect of subcortical lacunes and deep white matter demyelination on mood regulation in elders who experienced the first depressive episode. More recently, the chronic accumulation of lacunes in thalamus, basal ganglia and deep white matter has been considered as a strong correlate of PSD. We provide here a critical overview of neuroimaging and neuropathological sets of evidence regarding the affective repercussions of vascular burden in the aging brain and discuss their conceptual and methodological limitations. Based on these observations, we propose that the accumulation of small vascular and microvascular lesions constitutes a common neuropathological platform for both cognitive decline and depressive episodes in old age
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