97 research outputs found
Effects of local event-by-event conservation laws in ultrarelativistic heavy-ion collisions at particlization
Many simulations of relativistic heavy-ion collisions involve the switching from relativistic hydrodynamics to kinetic particle transport. This switching entails the sampling of particles from the distribution of energy, momentum, and conserved currents provided by hydrodynamics. Usually, this sampling ensures the conservation of these quantities only on the average, i.e., the conserved quantities may actually fluctuate among the sampled particle configurations and only their averages over many such configurations agree with their values from hydrodynamics. Here we apply a recently invented method [D. Oliinychenko and V. Koch, Phys. Rev. Lett. 123, 182302 (2019)PRLTAO0031-900710.1103/PhysRevLett.123.182302] to ensure conservation laws for each sampled configuration in spatially compact regions (patches) and study their effects: From the well-known (micro-)canonical suppression of means and variances to little studied (micro-)canonical correlations and higher-order fluctuations. Most of these effects are sensitive to the patch size. Many of them do not disappear even in the thermodynamic limit, when the patch size goes to infinity. The developed method is essential for particlization of stochastic hydrodynamics. It is useful for studying the chiral magnetic effect, small systems, and in general for fluctuation and correlation observables
Overview of light nuclei production in relativistic heavy-ion collisions
We briefly overview motivations, some recent results and challenges in
studying light nuclei production in relativistic heavy ion collisions.Comment: Proceedings of Quark Matter 2019 conferenc
The QCD phase diagram and statistics friendly distributions
The preliminary STAR data for proton cumulants for central collisions at s=7.7GeV component proton multiplicity distribution. We show that this two-component distribution is statistics friendly in that factorial cumulants of surprisingly high orders may be extracted with a relatively small number of events. As a consequence the two-component model can be tested and verified right now with the presently available STAR data from the first phase of the RHIC beam energy scan
Bimodality Phenomenon in Finite and Infinite Systems Within an Exactly Solvable Statistical Model
We present a few explicit counterexamples to the widely spread belief about
an exclusive role of the bimodal nuclear fragment size distributions as the
first order phase transition signal. In thermodynamic limit the bimodality may
appear at the supercritical temperatures due to the negative values of the
surface tension coefficient. Such a result is found within a novel exactly
solvable formulation of the simplified statistical multifragmentation model
based on the virial expansion for a system of the nuclear fragments of all
sizes. The developed statistical model corresponds to the compressible nuclear
liquid with the tricritical endpoint located at one third of the normal nuclear
density. Its exact solution for finite volumes demonstrates the bimodal
fragment size distribution right inside the finite volume analog of a gaseous
phase. These counterexamples clearly demonstrate the pitfalls of Hill approach
to phase transitions in finite systems.Comment: Talk given at the Helmholtz International Summer School "Physics of
Heavy Quarks and Hadrons", held in Dubna, Russia, July 15-28, 201
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