I am doing an undergraduate project on bars and I am trying to derive the bar instability mode given by Mo et al. It says "whether or not a disk is globally stable depends on the global properties of the disk... it is not possible to write down a universal dispersion relation or stability criterion."(adsbygoogle = window.adsbygoogle || []).push({});

I am wondering what the formal, physical definition of an instability is. I know it has something to do with potential energies. Could someone provide a general definition of an instability? Links to sources would be appreciate, as I might want to cite a definition.

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Deriving bar instability mode- formal definition of instability?

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

Loading...

Similar Threads - Deriving instability mode | Date |
---|---|

I How to derive full solar sprectrum from gamma rays | Sep 9, 2016 |

Possible to derive an approximation of G from a Saros ? | Oct 10, 2015 |

Derive the Kepler equation | Sep 12, 2015 |

Weibel instability experiment | Jan 24, 2015 |

**Physics Forums - The Fusion of Science and Community**