velitelem
Velitelem is a term used in speculative physics and science fiction to denote a hypothetical quasi-particle that encodes and transmits information about the velocity of matter and fields in a local region of spacetime. In proposed models, velitelems do not have a conventional rest mass as in the standard model; instead they arise from coupled velocity fields and can be described as fluctuations of a velocity potential. The concept functions as a theoretical tool to discuss how motion states propagate in non-standard media or in approaches to quantum gravity or emergent spacetime.
Etymology and scope: the name combines elements related to velocity and a notion of a fundamental unit,
Properties and role: in many sketches, velitelem has extremely small or effectively zero rest mass and propagates
Limitations and reception: velitelem remains hypothetical and is not supported by experimental evidence. It often requires
See also: tachyon, gauge boson, velocity field, emergent spacetime.