Speaker
Description
The development of collective dynamics in collisions involving small atomic nuclei at RHIC and the LHC is still a hot research topic. In the first part of the talk [1] we explore the applicability of hydrodynamics in small collision systems, using viscous anisotropic hydrodynamics (VAH). VAH is a form of relativistic fluid dynamics specifically designed to handle the large pressure anisotropies that occur during the early evolution stage at high collision energies. We explore its applicability across the entire spectrum of available collision systems, including p+p, p+Pb, p+Au, d+Au, $^3$He+Au, O+O, Xe+Xe, Au+Au, and Pb+Pb collisions at RHIC and/or the LHC. We show that for systems smaller than O+O the pressure anisotropy never becomes small enough to be reliably described by standard viscous fluid dynamics. In the second part of the talk [2] we use VAH to study a number of flow observables in p+p and p+Pb collisions at the LHC, with a particular focus on solving the sign problem of $c_2\{4\}$ that has plagued traditional viscous hydrodynamic simulations.
References
[1] S. Zhao, U. W. Heinz, H. Song, paper in preparation.
[2] S. Zhao, Y. Peng, U. W. Heinz, H. Song, paper in preparation
| Category | Theory |
|---|
