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Description
I describe a recently established connection between fluctuations of global event variables and large-scale features of two-particle momentum distributions in heavy-ion collisions by which a new momentum correlation induced by radial or transverse Hubble flow has been identified. This development provides information on the space-time structure of the freezeout surface at the fm length scale and has a cosmological analog in the use of red shifts and a universal Hubble-flow hypothesis to map relative galactic positions. The Hubble-flow method permits comparison between the correlation structure of the longitudinal phase space of hadron-hadron collisions and the transverse phase space of heavy-ion collisions. I present related results from NA49 Pb-Pb data, which may indicate the presence of lattice-like structures on the transverse hadronic freezeout surface. Recent predictions of suppressed fluctuations in conserved measures resulting from sudden traversal of the QCD phase boundary can be related to such structures. Small-scale probes of the hadronic freezeout surface via Hubble-flow effects may provide new access to details of the QCD phase boundary and hadronization.
Organiser(s): Yiota Foka, Ulrich Heinz and Urs Wiedemann
Organiser(s): Yiota Foka, Ulrich Heinz and Urs Wiedemann