Black Holes, Neutron Stars, and Gravitational Waves @ Black Sea

Stability of Neutron Stars for Causal Relativistic Viscous Fluids

16 Jun 2025, 17:20

15m

Varna, Bulgaria

Oral presentation

Speaker

Daniel Caballero (University of Illinois Urbana-Champaign)

Description

First order relativistic viscous theories had, until recently, been believed to not be well-behaved (i.e. causal, stable and strongly hyperbolic). Because of this, relativistic viscosity in astrophysical contexts has remained understudied. Recently, the Bemfica-Disconzi-Noronha-Kovtun (BDNK) theory has been shown to be causal, stable and strongly hyperbolic, which makes it a well-suited model for extending viscosity in the relativistic regime. In this presentation, I study the stability of neutron stars to viscous effects through perturbation theory and find necessary conditions for radial stability for the BDNK theory.