Strangeness production within Parton-Hadron-String Dynamics (PHSD)

The Parton-Hadron-String Dynamics (PHSD) transport approach consistently simulates the full evolution of a relativistic heavy-ion collision from the initial hard scatterings string formation through the dynamical deconfinement phase transition to the quark gluon plasma (QGP), to the hadronization and to subsequent interactions in the hadronic phase. The transport theoretical description of quarks and gluons is based on a dynamical quasiparticle model for partons matched to reproduce recent lattice QCD results in thermodynamic equilibrium. The transition from partonic to hadronic degrees of freedom is described by covariant transition rates for the fusion of quark-antiquark pairs or three quarks (antiquarks). Studying Pb+Pb reactions from 40 to 158 A GeV, we find that at most 40% of the collision energy is stored in the dynamics of the partons. This implies that a large fraction of non-partonic, i.e. hadronic or string-like matter, which can be viewed as a hadronic corona, is present in these reactions, thus neither hadronic nor purely partonic models can be employed to extract physical conclusions in comparing model results with data. On the other hand, comparing the PHSD results to those of the Hadron-String Dynamics (HSD) approach without the phase transition to QGP, we observe that the existence of the partonic phase has a sizeable influence on the transverse mass distribution of final kaons due to the repulsive partonic mean fields and initial partonic scattering. Furthermore, we find a significant effect of the QGP on the production of multi-strange antibaryons due to a slightly enhanced s+sbar pair production in the partonic phase from massive time-like gluon decay and to a more abundant formation of strange antibaryons in the hadronization process.Comment: Talk given at the International Conference Strangeness in Quark Matter 2009 (SQM 09

Urban Implications of Cultural Policy Networks. The Case of the Mount Vernon Cultural District in Baltimore

The intersection of urban and cultural policies has recently been at the center of international debate. The cultural planning approach argued that cultural policies can generally display positive effects in contemporary cities. The economic literature put forth spatial organization models of cultural institutions and producers, sometimes confirming policy makers’ expectations. Concerning the urban implications of cultural policies, many authors tended to be more skeptical and made several critical observations that can be better disclosed by analyzing cultural networks in urban policy making. Drawing on an extended case of Baltimore’s Mount Vernon Cultural District, I show that these critical factors are relevant but not determinant since they do not explain how and why cultural policy networks intervene in urban policy making. The analysis of Mount Vernon showed how a self-interested network promoted revitalization by framing a specific area as a ‘common campus’ and by integrating public, private, and nonprofit on this spatial basis. I suggest considering the implications of cultural networks in further urban research and policy making