Stratified disks are locally stable
Jeremy Goodman Steven A. Balbus
TL;DR
This paper proves that axisymmetrically stable stratified disks are locally stable by conducting an exact linear hydrodynamic stability analysis of a simplified flow model.
Contribution
It provides a rigorous proof that contradicts recent claims of instability, clarifying the stability properties of stratified disks.
Findings
No linear hydrodynamic instability in axisymmetrically stable disks
Exact stability analysis confirms local stability
Contradicts recent claims of instability
Abstract
Notwithstanding recent claims by Richard et al., there is no linear hydrodynamic instability of axisymmetrically stable disks in the local limit. We prove this by means of an exact stability analysis of an unbounded incompressible flow having constant stratification and constant shear.
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Astro and Planetary Science