When a gravitational potential changes slowly relative to an orbital period, the orbital actions remain constant provided no separatrix is crossed. In a spherical potential, angular momentum is conserved exactly and the radial action is adiabatically conserved.

Ancestors (9)

  1. Adiabatic invariance of the action
  2. Action variable
  3. Action-angle variables
  4. Integrable Hamiltonian system
  5. Hamiltonian mechanics
  6. Classical mechanics
  7. Branch of physics
  8. Physics
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