Collisionless free streaming is the ballistic motion of particles out of an overdensity. It erases perturbations below the comoving distance travelled by particles while their thermal velocities are appreciable.

Ancestors (9)

  1. Collisionless Jeans length
  2. Comoving Jeans length
  3. Jeans instability
  4. Jeans wavenumber
  5. Linear cosmological density perturbation
  6. Cosmology
  7. Branch of physics
  8. Physics
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