| 单词 | free streaming |
| 释义 | > as lemmasfree streaming free streaming n. and adj. Physics and Astronomy (a) n. unimpeded flow; (in fluid dynamics) inertial flow of a fluid unaffected by any obstruction or bounding surface; (in cosmology) the motion of particles which do not collide with each other or interact except gravitationally, and are therefore able to smooth out large-scale density inhomogeneities by moving unimpeded from overdense regions to underdense ones; (b) adj. that is undergoing free streaming. ΚΠ 1942 Proc. Royal Soc. A. 180 484 A general equation is deduced for the free streaming of any gas in any sloping, rectangular, air-filled gallery. 1972 Physics Lett. A 42 29 (title) Comments on the damping of ‘free-streaming’ waves in a plasma. 1982 Physical Rev. D. 25 214/1 Because of neutrino free-streaming, perturbations..are damped. 2001 J. D. Barrow & P. Coles Routledge Compan. New Cosmol. 337 In this model a process of free streaming occurs in the early Universe that erases structure on scales all the way up to the scale of a supercluster. 2003 M. Roos Introd. Cosmol. (ed. 3) viii. 222 At a photon's last scattering..the induced polarization remains and the subsequently free-streaming photon possesses a quadrupole moment. < as lemmas |
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