ELFT HÍRADÓ

[Somogyi Gábor <somogyi.gabor AT wigner.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


Prof. Azwinndini Muronga
(Summerstrand Campus South, South Africa)


“The Need for Beyond Second-Order Dissipative Fluid Dynamics for Heavy Ion 
Collisions and Astrophysics”


címmel tartandó szemináriumára.


Kivonat:



Accurate modelling of relativistic fluids under extreme conditions—such as 
those encountered in heavy ion collisions and astrophysical phenomena like 
neutron star mergers—requires a theoretical framework that extends beyond the 
limitations of first- and second-order dissipative fluid dynamics. While 
second-order theories, particularly the Israel-Stewart formalism, represent a 
critical improvement over first-order approaches by restoring causality and 
stability, they may fall short in far-from-equilibrium regimes where rapid 
expansion, large gradients, and strong coupling effects dominate.
This talk motivates the necessity of pursuing fluid dynamic theories beyond 
second order. We highlight three key reasons: (i) second-order approaches 
serve as the minimal bridge between classical and relativistic regimes, (ii) 
higher-order corrections depend on lower-order terms and may impose 
additional constraints on equilibrium behaviour, and (iii) essential 
couplings between dissipative processes—such as heat flow, shear, and bulk 
viscosities—are only fully realized at third order and beyond.
We will explore recent theoretical advancements, including third-order 
frameworks derived from kinetic theory and the entropy principle, and discuss 
their applications in modelling quark-gluon plasma evolution, early-time 
dynamics in heavy ion collisions, and relativistic transport in astrophysical 
systems. By addressing these needs, beyond-second-order fluid dynamics offers 
a more complete and predictive framework for studying complex relativistic 
systems across energy scales and environments.



Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2025 április 4. péntek d.u. 14 óra

Szívesen látunk minden érdeklődőt.


          Somogyi Gábor