Title: Relativistic fireworks: Not a viable model for cosmology
Abstract: view Abstract Citations References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Relativistic Fireworks: Not a Viable Model for Cosmology Widlund, Lennart Abstract The dynamics of the "fireworks model" for the universe is investigated, taking gravity fully into account. The fireworks model is a metagalactic model, which means that all matter observed is assumed to be a part of the metagalaxy: a huge, but finite aggregate of matter. In this way, the need for an initial singularity is avoided, and the Hubble expansion may be a result from some sort of explosion. However, it has proved to be surprisingly difficult to explain the highest redshifts observed in this way. The fireworks model is a possible remedy to that problem, where high redshifts are obtained in successive steps of explosion. In this paper, general relativistic Boltzmann-like equations are derived to describe the dynamics of such a model. The model is applied to cosmology in two ways. First, the nonrelativistic limit without gravity is investigated. In this case there are exact solutions to the equations. From these it is shown that a model with reasonable values of the density parameter and the random component of the peculiar velocity field cannot explain the highest redshifts observed. Then, a general relativistic perfect fluid approximation is treated numerically. Solutions are obtained where the redshifts have acceptable values. The velocity dispersion, in agreement with the nonrelativistic result, is by far too high to be compatible with observations. Publication: The Astrophysical Journal Pub Date: December 1994 DOI: 10.1086/174972 Bibcode: 1994ApJ...437...27W Keywords: Astronomical Models; Cosmology; Galactic Clusters; Relativity; Universe; Gravitational Effects; Mathematical Models; Relativistic Effects; Astrophysics; COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE; COSMOLOGY: THEORY; GALAXIES: CLUSTERING; RELATIVITY full text sources ADS |
Publication Year: 1994
Publication Date: 1994-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 1
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