[NT/RBRC seminar] Developments in Relativistic Dissipative Fluid Dynamics Theories Beyond Second-Order Formalism

by Prof. Azwinndini Muronga (Nelson Mandela University)

Friday 27 Sept 2024, 11:00 → 13:00 US/Eastern

CFNS seminar room (https://bnl.zoomgov.com/j/1614715193?pwd=WkwxODVWdzZzb29zQnZRVGp3VTBDQT09)

Relativistic dissipative fluid dynamics plays a pivotal role in modeling extreme conditions in high-energy physics and astrophysical environments, such as quark-gluon plasma (QGP) in heavy ion collisions, neutron star mergers, and core-collapse supernovae. While second-order formulations, most notably the Israel-Stewart formalism, have been instrumental in addressing causality and stability issues inherent in first-order theories, they may encounter limitations in far-from-equilibrium regimes where rapid expansion and strong gradients dominate.

This seminar explores the latest advancements in relativistic dissipative fluid dynamics beyond second-order formalism, focusing on third-order and higher-order corrections. We will discuss the derivation of third-order hydrodynamic equations, focusing on both the entropy principle and kinetic theory, their impact on improving the description of non-equilibrium phenomena, and their relevance in both theoretical and experimental contexts. Specifically, third-order terms provide more accurate predictions for early-time dynamics in heavy ion collisions, including elliptic flow and hydrodynamic attractors, and are increasingly significant in astrophysical simulations, such as those of neutron star mergers.

The seminar will also cover challenges associated with numerical implementation and the physical interpretation of higher-order terms, as well as the outlook for future research in this rapidly evolving field. By extending the current models, these developments offer deeper insights into the behavior of relativistic fluids under extreme conditions, providing a more comprehensive framework for both particle physics and astrophysical applications.