Collisionless may refer to:
*In information theory and computer science, computer networking architectures where
collisions between packets of data cannot occur
*In
computer science
Computer science is the study of computation, automation, and information. Computer science spans theoretical disciplines (such as algorithms, theory of computation, information theory, and automation) to practical disciplines (includi ...
, situations where collisions, or occurrences of the same value, cannot occur in a structure (and prevent reliable lookups)
*In cosmology and physics, a medium in which the
interaction cross-section between particles is so low that collisions between particles have no significant effect on the system. See
Shock waves in astrophysics
Shock waves are common in astrophysical environments.
Because of the low ambient density, most astronomical shocks are collisionless. This means that the shocks are not formed by two-body Coulomb collisions, since the mean free path for these ...
.
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