Future island universes in a background universe accelerated by a cosmological constant and by quintessence
Jul, 2001Citations per year
Abstract: (arXiv)
We study bound object formation in a background universe accelerated by cosmological constant and by quintessence. If the acceleration lasts forever, due to the existence of event horizon, one would have naively expected the universe to approach a state of cold death. However, we find that many local regions in the universe can in fact be protected by their own gravity to form mini-universes, provided that their present matter densities exceed some critical value. In the case with cosmological constant (CDM cosmology) the condition of forming mini-universe is that the ratio of present density parameters ought to be larger than a critical value 3.63. Such mini-universes typically weigh less than solar masses, with the lighter ones having tight and compact configurations. In the case with quintessence, the final ratio of a mini-universe is found to be always larger than , where is the equation of state parameter.- 98.80.Es
- cosmological constant
- quintessence
- cosmological model
- bound state
- background: expansion
- numerical calculations
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