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Future Island Universes in a Background Universe Accelerated by Cosmological Constant and by Quintessence | | Tzihong Chiueh
; Xiao-Gang He
; | | Date: |
24 Jul 2001 | | Journal: | Phys.Rev. D65 (2002) 123518 | | Subject: | astro-ph hep-ph | | Affiliation: | NTU) and Xiao-Gang He (NTU | | Abstract: | 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 ($Lambda$CDM cosmology) the condition of forming mini-universe is that the ratio of present density parameters $Omega_{i}^0/Omega_Lambda$ ought to be larger than a critical value 3.63. Such mini-universes typically weigh less than $2 imes 10^{14}$ solar masses, with the lighter ones having tight and compact configurations. In the case with quintessence, the final ratio $Omega_i/Omega_q$ of a mini-universe is found to be always larger than $w_q^2-w_q$, where $w_q$ is the equation of state parameter. | | Source: | arXiv, astro-ph/0107453 | | Services: | Forum | Review | PDF | Favorites | |
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