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Title:		Giant voids in the universe
Authors:		ZELDOVICH, IA. B.; EINASTO, J.; SHANDARIN, S. F.
Affiliation:		AA(Akademiia Nauk SSSR, Institut Prikladnoi Matematiki, Moscow, USSR) AB(Astrofizicheskaia Observatoriia, Tartu, Estonian SSR) AC(European Southern Observatory, Garching, West Germany)
Journal:		Nature, vol. 300, Dec. 2, 1982, p. 407-413.
Publication Date:		12/1982
Category:		Astrophysics
Origin:		STI
NASA/STI Keywords:		ASTRONOMICAL MODELS, GALACTIC CLUSTERS, GALACTIC EVOLUTION, GALACTIC STRUCTURE, SPATIAL DISTRIBUTION, UNIVERSE, ADIABATIC CONDITIONS, COSMOLOGY, MASS DISTRIBUTION, NEUTRINOS
Bibliographic Code:		1982Natur.300..407Z

Abstract

It is indicated by recent observations that, while most galaxies are concentrated in superclusters, giant volumes exist between superclusters which are almost empty of visible objects. Because galaxy formation theories predicting the formation of nonspherical superclusters and giant voids hold that large scale structure changes very slowly, the currently observed structures reflect the entire history of galaxy formation and structural evolution. The most developed scenarios of the formation of large scale structure are based on two different assumptions as to the character of perturbations in the predecoupling era. In the adiabatic perturbation scenario, it is supposed that both matter and radiation density were perturbed at an early stage, so that their ratio was constant in space and time. In the isothermal scenario, it is thought that matter density was perturbed, but not radiation density, so that temperature was everywhere the same.

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