A5082606628- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Laser-induced spectroscopy and plasma
- Pulsars and Gravitational Waves Research
- Nuclear physics research studies
- Laser-Plasma Interactions and Diagnostics
- Theoretical and Computational Physics
- Ion-surface interactions and analysis
- High-pressure geophysics and materials
- Cold Atom Physics and Bose-Einstein Condensates
- Laser-Matter Interactions and Applications
- Stochastic processes and statistical mechanics
- Gamma-ray bursts and supernovae
- Quantum, superfluid, helium dynamics
- Gas Dynamics and Kinetic Theory
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Statistical Mechanics and Entropy
- Gold and Silver Nanoparticles Synthesis and Applications
- Magnetic confinement fusion research
- nanoparticles nucleation surface interactions
- Laser Material Processing Techniques
University of Bergen
2016-2025
HUN-REN Wigner Research Centre for Physics
2012-2025
Frankfurt Institute for Advanced Studies
2007-2025
Innovation Norway (Norway)
2023
National Research, Development and Innovation Office
2022
China University of Geosciences
2020
Goethe University Frankfurt
1981-2012
Institute for Particle and Nuclear Physics
2002-2012
Goethe Institute
2010
Universitat de Barcelona
2007
Substantial collective flow is observed in collisions between large nuclei at BNL RHIC (Relativistic Heavy Ion Collider) as evidenced by single-particle transverse momentum distributions and azimuthal correlations among the produced particles. The data are well reproduced perfect fluid dynamics. A calculation of dimensionless ratio shear viscosity $\ensuremath{\eta}$ to entropy density $s$ Kovtun, Son, Starinets within anti-de Sitter space/conformal field theory yields...
We predict the polarization of $\ensuremath{\Lambda}$ and $\overline{\ensuremath{\Lambda}}$ hyperons in peripheral heavy ion collisions at ultrarelativistic energy, based on assumption local thermodynamical equilibrium freeze-out. The vector is proportional to curl inverse temperature four-vector field its length, order percents, maximal for a particle with moderately high momentum lying reaction plane. A selective measurement these particles could make detectable.
We apply the general formalism of Langer to compute nucleation rate for systems relativistic particles with a zero or small baryon-number density and which undergo first-order phase transitions. In particular, we obtain an expression pre-exponential factor it is proportional viscosity. The initial growth critical size bubble droplet limited by ability dissipative processes transport latent heat away from surface.
With a Yang-Mills flux-tube initial state and high resolution (3+1)D Particle-in-Cell Relativistic (PICR) hydrodynamics simulation, we calculate the $\Lambda$ polarization for different energies. The origination of in energy collisions is discussed, find linear impact parameter dependence global polarization. Furthermore, our model decreases very fast low domain, decline curve fits well recent results Beam Energy Scan (BES) program launched by STAR collaboration at Heavy Ion Collider (RHIC)....
We apply a recently computed nucleation rate to first-order deconfinement/chiral-symmetry restoring phase transition in set of equations study the time evolution expanding quark-gluon plasma as it converts hadronic matter. At energies BNL Relativistic Heavy Ion Colliders, system must supercool about 20% below ${\mathit{T}}_{\mathit{c}}$ before bubbles is sufficiently rapid overcome expansion rate. The reheats near ${\mathit{T}}_{\mathit{c}}$, turns off, and completed by growth previously...
A new rapid hadronization scenario is proposed based on the dynamical chiral model including quarks interacting with background meson fields. We estimate time scales and spatial characteristics of chiral-symmetry breaking instabilities in expanding, nonthermal quark-gluon plasma. The transition from chirally symmetric to broken state proceeds through formation multiquark-antiquark clusters, surrounded by domains coherent field.
The fluid dynamical model is used to study the reactions $^{20}\mathrm{Ne}$+$^{238}\mathrm{U}$ and $^{40}\mathrm{Ar}$+$^{40}\mathrm{Ca}$ at ${E}_{\mathrm{lab}}=390$ MeV/nucleon. calculated double differential cross sections ${d}^{2}\frac{\ensuremath{\sigma}}{d\ensuremath{\Omega}}\mathrm{dE}$ exhibit sidewards maxima in agreement with recent experimental data. azimuthal dependence of triple distributions, be obtained from an event-by-event analysis $4\ensuremath{\pi}$ exclusive experiments,...
In this brief report, we present laser induced breakdown spectroscopy (LIBS) evidence of deuterium (D) production in a 3:1 urethane dimethacrylate (UDMA) and triethylene glycol (TEGDMA) polymer doped with resonant gold nanorods, by intense, 40 fs pulses. The situ recorded LIBS spectra revealed that the D/(2D + H) increased to 4-8% samples selected events. extent transmutation was found linearly increase pulse energy (intensity) between 2 25 mJ (up 3 × 10
The predictions of a variety current theoretical models high-energy nuclear collisions are compared with recent experimental data for central $^{20}\mathrm{Ne}$ on $^{238}\mathrm{U}$ at ${E}_{\mathrm{lab}}=393$ MeV/u. observation broad sideward maxima in the angular distributions low- and medium-energy protons is reproduced by fluid-dynamical calculation final freezeout protons. In contrast, intranuclear-cascade simplified collision predict forward-peaked distributions.
The dynamical development of collective flow is studied in a (3+1)-dimensional fluid model, with globally symmetric, peripheral initial conditions, which take into account the shear caused by forward motion on projectile side and backward target side. While at $\sqrt{{s}_{NN}}=2.76A$ TeV semiperipheral $\text{Pb}+\text{Pb}$ collisions earlier predicted rotation effect visible, more collisions, high resolution low numerical viscosity, Kelvin-Helmholtz instability observed, alters pattern...
Substantial collective flow is observed in collisions between Lead nuclei at LHC as evidenced by the azimuthal correlations transverse momentum distributions of produced particles. Our calculations indicate that Global v1-flow, which RHIC peaked negative rapidities (named 3rd component or anti-flow), now going to turn toward forward (to same side and direction projectile residue). Potentially this can provide a sensitive barometer estimate pressure transport properties Quark-Gluon Plasma....
The polarization of $\mathrm{\ensuremath{\Lambda}}$ hyperons from relativistic flow vorticity is studied in peripheral heavy ion reactions at FAIR and NICA energies, just above the threshold transition to quark-gluon plasma. Previous calculations higher energies with larger initial angular momentum, predicted significant based on classical term polarization, while modifications decreased changed its structure momentum space. At lower here, we see same effect namely that decrease arising...
Relativistic Heavy Ion Collisions allow to create ultra hot and dense systems, where a phase transition from hadronic matter quark-gluon is expected occur. Nowadays the progress of experimental techniques allows analyze these collisions on an event-by-event basis, most advanced theoretical simulations are performed within so-called hybrid models, different stages reaction each simulated with suitable approach. Our group also uses such approach – initial Generalized Effective String Rope...
Strangeness production at the CERN Super Proton Synchrotron energies is studied within quark-gluon string model. The observed shape of rapidity and transverse mass distributions are reproduced fairly well for both peripheral central heavy ion collisions. However, collisions model underpredicts strange particle abundances by a factor about 2:2:4 ${\mathit{K}}_{\mathit{S}}^{0}$, \ensuremath{\Lambda}, \ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}, respectively. This discrepancy can...
Abstract The bonding configuration of the crater walls formed in urethane dimethacrylate-based polymer doped with plasmonic gold nanorods upon irradiation a single-shot high-energy femtosecond laser pulse has been studied by Raman spectroscopy. New bands were detected 2000–2500 cm -1 region spectrum intensities which showed strong dependence on concentration nanoparticles and energy pulse. Based model calculations frequencies these peaks attributed to carbon-deuterium nitrogen-deuterium...
A model for energy, pressure, and flow velocity distributions at the beginning of ultrarelativistic heavy ion collisions is presented, which can be used as an initial condition hydrodynamic calculations. Our takes into account baryon recoil both target projectile, arising from acceleration partons in effective field ${F}^{\ensuremath{\mu}\ensuremath{\nu}}$ produced collision. The typical strength (string tension) RHIC energies about 5--12 GeV/fm, allows us to talk ``string ropes.'' results...
With a Yang-Mills field, stratified shear flow initial state and high resolution (3+1)D Particle-in-Cell Relativistic (PICR) hydrodynamic model, we calculate the $\Lambda$ polarization for peripheral Au+Au collisions at RHIC energy of $\sqrt{S_{NN}}=200$ GeV. The obtained longitudinal in our model agrees with experimental signature quadrupole structure on transverse momentum plane. It is found that relativistic correction (2nd term), arising from expansion time component thermal vorticity,...