Abstract
PURCELL (unpublished data) has noted the tendency for ‘dust’ particles strongly to cluster when they are coupled by viscous drag to a ‘gas’ whose velocity field is stochastic: 
where α(s−1) is the viscous coupling constant. The application of the Purcell clustering effect to cosmology which is considered here generates relatively large isothermal perturbations from relatively small adiabatic perturbations which will not otherwise survive damping during recombination.
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PRESS, W., VISHNIAC, E. Production of new cosmological perturbations during the radiation-dominated era. Nature 279, 137–139 (1979). https://doi.org/10.1038/279137a0
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Further reading
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Stability of small-scale baryon perturbations during cosmological recombination
Physical Review D (2015)
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Viscous cosmological structures
Physics Letters A (1990)
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Cosmological consequences of grand unified theories on density fluctuations
Nature (1981)
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Spontaneous Production of the Zel'dovich Spectrum of Cosmological Fluctuations
Physica Scripta (1980)
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Magnetohydrodynamic Solution to the Problem of the Origin of Galaxies in an Expanding Universe
Physical Review Letters (1980)
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