Speaker
Yago Bea
Description
Recent studies point in the direction that viscosity might be relevant in neutron star mergers. The usual approach to introduce viscosity in relativistic systems, MIS-like theories, has been recently shown to present some limitations. In particular, it presents limitations when dealing with shocks, features present in neutron star mergers. The first-order viscous theory of hydrodynamics proposed by Bemfica, Disconzi, Noronha and Kovtun (BDNK) does not have these limitations and appears as a very good alternative to MIS-like theories. We perform numerical studies of this theory and we use holography to study its regime of applicability by comparing to real-time evolutions of microscopic systems, assessing its accuracy and predictive power.
