Conveners
Parallel Session 3
- Jean-Yves OLLITRAULT
- Jean-Yves Ollitrault
A promising area of development in QCD research is extending beyond the well-studied boost-invariant or (2+1)D picture of QGP evolution and into (3+1)D. Doing so offers a powerful means of further constraining the validity and the parameters of successful collision models and thus allows us to refine our knowledge of the properties of the QGP. However, the extra dimension also introduces...
Measurements of different flow harmonics relative to the participant and spectator planes provide unique insight into the initial conditions and the space-time evolution of the quark-gluon plasma (QGP). Different particle-type dependencies of these flow harmonics allow to separate the effects of QGP evolution and initial state fluctuations. Elliptic flow coefficients ($v_{2}$) relative to the...
We present the first studies of net-charge fluctuations and charge-balance functions using the broad rapidity coverage of the CMS experiment. These types of event-by-event fluctuations are a powerful tool to characterize the thermodynamic properties of the quark-gluon plasma (QGP). The net-charge of the system, e.g., quantified by the $\nu_{dyn}$ observable, is a conserved quantity, meaning...
One of the main challenges in the theory of heavy ion collisions is understanding how an initial state of two highly Lorentz-contracted nuclei acquires the features of a hydrodynamic plasma in a characteristic time of 1 fm/c. Arguably, the most successful descriptions of this out-of-equilibrium stage have been established by seeking and finding so-called “attractor” solutions in the various...
High energy nuclear collisions produce far-from-equilibrium matter with a high density of gluons at early times. We identify for the first time two local order parameters for condensation, which can occur as a consequence of the large density of gluons. We demonstrate that an initial over-occupation of gluons can lead to the formation of a macroscopic zero mode towards low momenta that scales...
Heavy-ion collisions can be well described through relativistic viscous hydrodynamics, but questions still remain when hydrodynamics is applicable because the initial state may begin very far-from-equilibrium.
Thus, a pre-equilibrium evolution phase is used to bridge the gap between the initial state and hydrodynamics. K$\phi$MP$\phi$ST is one such pre-equilibrium model that propagates the...
