PhysicsCircus

Density Waves
1.History of galaxies
（1）Classification of galaxies
（2）Island universe
（3）Hubble's tuningfork diagram
（4）Early theory of formation of galaxies
2.
（1）Spiral galaxies
（2）Our Milky Way
（3）Rotation of Milky Way
      （A）differential rotation
      （B）rotation curve violates rigid body kinematics and Kepler’s law of motin
      （C）something unvisible with effective mass（maybe dark matter or nutrino）
3.Density Wave Theory
Frank H. Shu（徐遐生）、Lin（林家翹）
（1）Traffic model
（2）Mechanism that triggers the formation of stars throughout spiral front
（3）Density wave velocity
（4）Scheme of density wave
（5）Normal modes of galaxy
（6）Numerical simulation of an uniformly rotating disk
4.Application of the inspiration of density wave theory
  Ex：Stablity of Saturn rings
5.Special cases
6.Conclusion and Comment：

# posted by samuel @ 7:54 PM