H. Heiselberg

Elliptic Flow at SPS and RHIC: From Kinetic Transport to Hydrodynamics

Anisotropic transverse flow is studied in Pb + Pb and Au + Au collisions at SPS and RHIC energies. The centrality and transverse momentum dependence at midrapidity of the elliptic flow coefficient v2 is calculated in the hydrodynamic and low density limits. Hydrodynamics is found to agree well with the RHIC data for semicentral collisions up to transverse momenta of 1–1.5 GeV/c, but it considerably overestimates the measured elliptic flow at SPS energies. The low density limit LDL is inconsistent with the measured magnitude of v2 at RHIC energies and with the shape of its pt -dependence at both RHIC and SPS energies. The success of the hydrodynamic model points to very rapid thermalization in Au + Au collisions at RHIC and provides a serious challenge for kinetic approaches based on classical scattering of on-shell particles.  2001 Published by Elsevier Science B.V.

Electrical conductivity in the early universe

We calculate the electrical conductivity in the early universe at temperatures below as well as above the electroweak vacuum scale,

Event-by-Event Fluctuations in Ultrarelativistic Heavy-Ion Collisions

{T}_{c}\ensuremath{\simeq}100\mathrm{GeV}.

Correlations and fluctuations in high-energy nuclear collisions.

Debye and dynamical screening of electric and magnetic interactions leads to a finite conductivity,

Microscopic calculation of antiproton atomic-like bound states in light nuclei

{\ensuremath{\sigma}}_{\mathrm{el}}\ensuremath{\sim}T/\ensuremath{\alpha}\mathrm{ln}(1/\ensuremath{\alpha}),

Microscopic calculation of antiproton-nucleus elastic scattering

at temperatures well below

Strange Quark Decay Rates in Quark Matter at High Temperatures

{T}_{c}.

Antiproton-nucleus bound states and the reaction A(p,p)

At temperatures above,

Phenomenological analyses of antiproton elastic scattering data

{W}^{\ifmmode\pm\else\textpm\fi{}}

Antiproton elastic scattering on even-even nuclei

charge-exchange processes---analogous to color exchange through gluons in QCD---effectively stop left-handed charged leptons. However, right-handed leptons can carry current, resulting in