Preprints

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2020-02-14
13:59
[GSI-2020-00325] Preprint

Equation of state constraints from multi-messenger observations of neutron star mergers
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ddc:530
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2019-12-23
01:03
arXiv [GSI-2019-01279] Preprint/Report
et al
A new review of excitation functions of hadron production in $pp$ collisions in the NICA energy range
[arXiv:1912.01979]
A new review of excitation functions of hadron production in $pp$ collisions in the NICA energy range

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2019-12-23
01:01
arXiv [GSI-2019-01278] Preprint/Report
et al
Parton Hadron Quantum Molecular Dynamics (PHQMD) -- a Novel Microscopic N-Body Transport Approach for Heavy-Ion Dynamics and Hypernuclei Production
[arXiv:1911.11892]
We present the novel microscopic n-body dynamical transport approach PHQMD(Parton-Hadron-Quantum-Molecular-Dynamics) for the description of particle production and cluster formation in heavy-ion reactions at relativistic energies. The PHQMD extends the established PHSD (Parton-Hadron-String-Dynamics) transport approach by replacing the mean field by density dependent two body interactions in a similar way as in the Quantum Molecular Dynamics (QMD) models. [...]

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2019-12-23
00:57
arXiv [GSI-2019-01277] Preprint/Report
et al
The PHQMD model for the formation of nuclear clusters and hypernuclei in heavy-ion collisions
[arXiv:1911.09496]
Modeling of the process of the formation of nuclear clusters in the hot nuclear matter is a challenging task. We present the novel n-body dynamical transport approach - PHQMD (Parton-Hadron-Quantum-Molecular Dynamics) [1] for the description of heavy-ion collisions as well as clusters and hpernuclei formation. [...]

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2019-12-23
00:52
arXiv [GSI-2019-01276] Preprint/Report

Transport coefficients for the hot quark-gluon plasma at finite chemical potential $\mu_B$
[arXiv:1911.08547]
We calculate transport coefficients of the quark-gluon plasma (QGP) within the dynamical quasiparticle model (DQPM) by explicitly computing the parton interaction rates as a function of temperature $T$ and baryon chemical potential $\mu_B$ on the basis of the DQPM couplings and partonic propagators. The latter are extracted from lattice QCD by matching the equation of state, entropy density and energy density at $\mu_B$= 0. [...]

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2019-12-23
00:49
arXiv [GSI-2019-01275] Preprint/Report
et al
Transport coefficients of hot and dense matter
[arXiv:1911.03131]
We present calculations for the shear viscosity of the hot and dense quark-gluon plasma (QGP) using the partonic scattering cross sections as a function of temperature $T$ and baryon chemical potential $\mu_B$ from the dynamical quasiparticle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature $T_c$ from lattice QCD. To this aim we calculate the collisional widths for the partonic degrees of freedom at finite $T$ and $\mu_B$ in the time-like sector and conclude that the quasiparticle limit holds sufficiently well. [...]

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2019-12-23
00:45
arXiv [GSI-2019-01274] Preprint/Report
et al
Exploring non-equilibrium quark-gluon plasma effects on charm transport coefficients
[arXiv:1910.09889]
In this article we investigate how the drag coefficient $A$ and $\hat{q}$, the transverse momentum transfer by unit length, of charm quarks are modified if the QGP is not in complete thermal equilibrium using the dynamical quasi-particle model (DQPM) which reproduces both, the equation-of-state of the QGP and the spatial diffusion coefficient of heavy quarks as predicted by lattice QCD calculations. We study three cases: a) the QGP has an anisotropic momentum distribution of the partons which leads to an anisotropic pressure b) the QGP partons have higher or lower kinetic energies as compared to the thermal expectation value, and c) the QGP partons have larger or smaller pole masses of their spectral function as compared to the pole mass from the DQPM at the QGP temperature. [...]

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2019-12-23
00:40
arXiv [GSI-2019-01273] Preprint/Report
et al
PHSD -- a microscopic transport approach for strongly interacting systems
[arXiv:1908.00451]
We present the basic ideas of the Parton-Hadron-String Dynamics (PHSD) transport approach which is a microscopic covariant dynamical model for strongly interacting systems formulated on the basis of Kadanoff-Baym equations for Green's functions in phase-space representation (in 1st order gradient expansion beyond the quasi-particle approximation). The approach consistently describes the full evolution of a relativistic heavy-ion collision from the initial hard scatterings and string formation through the dynamical deconfinement phase transition to the strongly-interacting quark-gluon plasma (sQGP) as well as hadronization and the subsequent interactions in the expanding hadronic phase. [...]

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2019-12-23
00:01
arXiv [GSI-2019-01269] Preprint/Report
et al
Parton-Hadron-Quantum-Molecular Dynamics (PHQMD) -- A Novel Microscopic N-Body Transport Approach for Heavy-Ion Collisions, Dynamical Cluster Formation and Hypernuclei Production
[arXiv:1907.03860]
Cluster and hypernuclei production in heavy-ion collisions is presently under active experimental and theoretical investigation. Since clusters are weekly bound objects, their production is very sensitive to the dynamical evolution of the system and its interactions. [...]

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2019-12-16
17:05
arXiv [GSI-2019-01256] Preprint
et al
Influence of electromagnetic fields in proton-nucleus collisions at relativistic energy

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