Models of voids in the expanding universe

Details Models of voids in the expanding universe Models of voids in the expanding universe

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361...21b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 21-26. Research supported by the Ministerio de Educ

Astronomy and Astrophysics

Astrophysics

29

Astronomical Models, Big Bang Cosmology, Galactic Clusters, Space-Time Functions, Curvature, Mass Distribution, Minkowski Space

Scientific paper

A void in the expanding universe is modeled by a spherical Minkowski region in a Tolman dust spacetime which tends asymptotically to a Friedmann universe. It is found that (1) a void cannot exist in a universe of positive spatial curvature, (2) a nonexpanding void can be matched only to a parabolic exterior, and (3) an expanding void requires an exterior region of negative spatial curvature. Detailed models of a nonexpanding void, and of an expanding one, are presented.

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