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.
"Free streaming" generally refers to the ability to watch or listen to content online without having to pay for it. This term is often associated with various types of media, including movies, TV shows, music, and live broadcasts. However, it can have different implications depending on the context: 1. **Ad-Supported Services**: Many platforms, such as YouTube and some music services, offer free streaming options that are funded by advertisements.
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