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AbstractAbstract
[en] In this thesis the first fully integrated Boltzmann+hydrodynamics approach to relativistic heavy ion reactions has been developed. After a short introduction that motivates the study of heavy ion reactions as the tool to get insights about the QCD phase diagram, the most important theoretical approaches to describe the system are reviewed. The hadron-string transport approach that this work is based on is the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) approach. Predictions for the charged particle multiplicities at LHC energies are made. The next step is the development of a new framework to calculate the baryon number density in a transport approach. Time evolutions of the net baryon number and the quark density have been calculated at AGS, SPS and RHIC energies. Studies of phase diagram trajectories using hydrodynamics are performed. The hybrid approach that has been developed as the main part of this thesis is based on the UrQMD transport approach with an intermediate hydrodynamical evolution for the hot and dense stage of the collision. The full (3+1) dimensional ideal relativistic one fluid dynamics evolution is solved using the SHASTA algorithm. Three different equations of state have been used, namely a hadron gas equation of state without a QGP phase transition, a chiral EoS and a bag model EoS including a strong first order phase transition. For the freeze-out transition from hydrodynamics to the cascade calculation two different set-ups are employed. The parameter dependences of the model are investigated and the time evolution of different quantities is explored. The hybrid model calculation is able to reproduce the experimentally measured integrated as well as transverse momentum dependent v2 values for charged particles. The multiplicity and mean transverse mass excitation function is calculated for pions, protons and kaons in the energy range from Elab=2-160 A GeV. The HBT correlation of the negatively charged pion source created in central Pb+Pb collisions at SPS energies are investigated with the hybrid model. (orig.)
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Source
22 Apr 2009; 182 p; Diss. (Dr.rer.nat.)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Report Number
Country of publication
ALGORITHMS, BAG MODEL, BOLTZMANN EQUATION, CHARGED PARTICLES, CHIRALITY, CORRELATIONS, DEEP INELASTIC HEAVY ION REACTIONS, EFFECTIVE MASS, EQUATIONS OF STATE, EXCITATION FUNCTIONS, FINAL-STATE INTERACTIONS, FOUR-DIMENSIONAL CALCULATIONS, HADRON-HADRON INTERACTIONS, HYDRODYNAMICS, KAONS, LEAD 208 REACTIONS, LEAD 208 TARGET, MASS SPECTRA, MOLECULAR DYNAMICS METHOD, MULTIPLE PRODUCTION, MULTIPLICITY, NUCLEAR MATTER, NUCLEAR REACTION KINETICS, PHASE TRANSFORMATIONS, PIONS MINUS, PROTONS, RELATIVISTIC RANGE, S CODES, STRING MODELS, THERMAL EQUILIBRIUM, TRANSITION HEAT, TRANSPORT THEORY, TRANSVERSE MOMENTUM
BARYONS, BOSONS, CALCULATION METHODS, COMPOSITE MODELS, COMPUTER CODES, CROSS SECTIONS, DIFFERENTIAL CROSS SECTIONS, DIFFERENTIAL EQUATIONS, ELEMENTARY PARTICLES, ENERGY RANGE, ENTHALPY, EQUATIONS, EQUILIBRIUM, EXTENDED PARTICLE MODEL, FERMIONS, FLUID MECHANICS, FUNCTIONS, HADRONS, HEAVY ION REACTIONS, INTEGRO-DIFFERENTIAL EQUATIONS, INTERACTIONS, KINETIC EQUATIONS, KINETICS, LINEAR MOMENTUM, MASS, MATHEMATICAL LOGIC, MATHEMATICAL MODELS, MATTER, MECHANICS, MESONS, NUCLEAR REACTIONS, NUCLEONS, PARTIAL DIFFERENTIAL EQUATIONS, PARTICLE INTERACTIONS, PARTICLE MODELS, PARTICLE PRODUCTION, PARTICLE PROPERTIES, PHYSICAL PROPERTIES, PIONS, PSEUDOSCALAR MESONS, QUARK MODEL, REACTION KINETICS, SPECTRA, STRANGE MESONS, STRANGE PARTICLES, TARGETS, THERMODYNAMIC PROPERTIES
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