4 research outputs found
Onset of cavitation in the quark-gluon plasma
We study the onset of bubble formation (cavitation) in the quark-gluon plasma
as a result of the reduction of the effective pressure from bulk-viscous
corrections. By calculating velocity gradients in typical models for
quark-gluon plasma evolution in heavy-ion collisions, we obtain results for the
critical bulk viscosity above which cavitation occurs. Since present
experimental data for heavy-ion collisions seems inconsistent with the presence
of bubbles above the phase transition temperature of QCD, our results may be
interpreted as an upper limit of the bulk viscosity in nature. Our results
indicate that bubble formation is consistent with the expectation of
hadronisation in low-temperature QCD.Comment: 12 pages, 2 figure
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On Various Aspects of Ion Collisions Analyzed Via a Hydrodynamic Hybrid Approach
In this thesis, various theoretical results surrounding the quark--gluon plasma which is created in the ultrarelativistic collisions of ions are presented. The many-body, strong-coupling, and real-time characteristics of those collisions partially exclude first-principle quantum chromodynamics calculations, whereas the effective theory of hydrodynamics allows for a rather successful description of the quark--gluon plasma. A criterion of hydrodynamic stability is used to restrict the transport coefficient bulk viscosity. In addition, various collisional systems over a wide range of energy are successfully modeled for particle spectra, yields, flow coefficients, and HBT radii. Despite questions of hydrodynamic applicability to few-particle systems, there is reasonable agreement with experimental data for p+p collisions in this framework. Notably, the strong dependence on the bulk viscosity of simulation results for p+p collisions could help constrain this transport coefficient. All of those aspects solidify our quantitative understanding of the quark--gluon plasma produced in ion collisions