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The theory of gravitational structure formation in astrophysics and cosmologyis revised based on real fluid behavior and turbulent mixing theory. Gibson's1996-1998 theory balances fluid mechanical forces with gravitational forces anddensity diffusivity with gravitational diffusivity at critical viscous,turbulent, magnetic, and diffusion length scales termed Schwarz scales L_SX.Condensation and void formation occurs on non-acoustic density nuclei producedby turbulent mixing for scales L>=L_SXmax rather than on sound wave crests andtroughs for L>=L_J as required by Jeans's 1902 linear acoustic theory. Schwarzscales L_SX = L_SV, L_ST, L_SM, or L_SD may be smaller or larger than Jeans'sscale L_J. Thus, a very different "nonlinear" cosmology emerges to replace thecurrently accepted "linear" cosmology. According to the new theory, most of theinner halo dark matter of galaxies consists of planetary mass objects thatformed soon after the plasma to neutral gas transition 300,000 years after theBig Bang. These objects are termed primordial fog particles (PFPs) and providean explanation for Schild's 1996 "rogue planets ... likely to be the missingmass" of his observed quasar-lens galaxy, inferred from the twinklingfrequencies of both quasar images and their phased difference.

Turbulent Mixing, Viscosity, Diffusion, and Gravity in the Formation of Cosmological Structures: The Fluid Mechanics of Dark Matter