29 research outputs found
Strangeness and Quark--Gluon Plasma
I review the foundational motivation which led us to the ultra relativistic
heavy ion collision research at SPS, RHIC and now LHC: the quantum vacuum
structure; the deconfined nature of quark-gluon plasma (QGP) phase filling the
Universe for the first 30s after the big-bang; the origin of stable matter
mass; and of the origin of flavor. The special role of strangeness enhancement
and strange antibaryon signature is highlighted. It is shown how hadron
production can be used to determine the properties of QGP, and how the
threshold energy for QGP formation is determined.Comment: Jubilee Lecture at SQM2011 in Krakow, Poland to appear in Acta
Physica Polonica
Strangeness and Statistical Hadronization: How to Study Quark-Gluon Plasma
Statistical hadronization is presented as mechanism for (strange) particle
production from a deconfined quark--gluon plasma (QGP) fireball. We first
consider hadronic resonance production at RHIC as a test of the model.
We present in detail how the hadrochemistry determines particle
multiplicities and in case of sudden hadronization allows investigation of QGP
properties. A comparative study of strange hadron production at SPS and RHIC is
presented. The energy dependence of physical observables shows regularities and
a potential discontinuity in the low RHIC range, when comparing these different
energy domains. Considering the energy scan program at CERN-SPS we show that
the K^+/\pi^+ discontinuity is a baryon density effect.Comment: 35 pages, 15 figures, presented at the Cracow School of Theoretical
Physics, Zakopane, May 30 - June 8, 200
Strangeness in QGP: Hadronization Pressure
We review strangeness as signature of quark gluon plasma (QGP) and the
hadronization process of a QGP fireball formed in relativistic heavy-ion
collisions in the entire range of today accessible reaction energies. We
discuss energy dependence of the statistical hadronization parameters within
the context of fast QGP hadronization. We find that QGP breakup occurs for all
energies at the universal hadronization pressure .Comment: 14 pages, one picture, 10 figures, Talk presented at the XXXI Max
Born Symposium and HIC for FAIR Workshop "Three Days of Critical Behavior in
Hot and Dense QCD", Wroclaw, Poland, June~14-16, 2013. Acta Physica Polonica
B: Conference Series in pres
Planetary Impacts by Clustered Quark Matter Strangelets
We propose a model of clustered u-d-s quark matter that leads to stable bulk
strange quark matter. We discuss qualitatively consequences of impacts by
sub-planetary mass strangelets on rocky solar system bodies.Comment: 6 pages, 1 figure, SQM 2011 Proceeding
Dynamics of Multiparticle Systems with non - Abelian Symmetry
We consider the dynamics governing the evolution of a many body system
constrained by an nonabelian local symmetry. We obtain explicit forms of the
global macroscopic condition assuring that at the microscopic level the
evolution respects the overall symmetry constraint. We demonstrate the
constraint mechanisms for the case of SU(2) system comprising particles in
fundamental, and adjoint representations (`nucleons' and `pions').Comment: Minor claryfying correstions and improving of references were done.
Accepted for publication in EPJ
Strangeness Production in Au--Au collisions at GeV
We obtain strangeness production as function of centrality in a statistical
hadronization model analysis of all experimental hadron production data in
Au--Au collisions at \sqrt{s_{NN}}=62.4\GeV. Our analysis describes
successfully the yield of strange and multi-strange hadrons recently published.
We explore condition of hadronization as a function of centrality and find
universality for the case of chemical non-equilibrium in the hadron phase space
corresponding to quark--gluon plasma (QGP) in chemical equilibrium.Comment: 6 pages, 2 figures, proceedings for SQM 2011 conferenc
Nonlinear Electromagnetic Forces in Astrophysics
Electromagnetism becomes a nonlinear theory having (effective) photon-photon
interactions due at least to electron-positron fluctuations in the vacuum. We
discuss the consequences of the nonlinearity for the force felt by a charge
probe particle, and compare the impact of Euler-Kockel QED effective
nonlinearity to the possibility of Born-Infeld-type nonlinearity.Comment: 14 pages, 2 figures, Acta Phys Pol B style, presented by LL at 52
Krakow School of Theoretical Physics: Astroparticle Physics in the LHC Era,
Zakopane, May 19-27, 201