Models of voids in elliptic universes

Details Models of voids in elliptic universes Models of voids in elliptic universes

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383...51c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 10, 1991, p. 51-55. Research supported by Universidad del Pais Va

Astronomy and Astrophysics

Astrophysics

6

Cosmology, Galactic Clusters, Universe, Voids, Einstein Equations, Mathematical Models, Space Density, Space-Time Functions

Scientific paper

Models for nonempty spherical voids in elliptic universes are constructed. The models consist of an underdense Friedmann region - the void - an intervening Tolman region, and an exterior Friedmann universe. In order to achieve a significant underdensity, in fact as small as wanted but nonzero, it is necessary to allow for a prematurely born void. It is then possible to choose the arbitrary functions in the Tolman metric of the intervening zone in such a way that the models are exempt from shell-crossings during their whole history. In that case there is a first region in the intervening Tolman zone containing the oldest matter in the universe, and a second region with the youngest.

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