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Particle horizon
About: Particle horizon is a research topic. Over the lifetime, 2096 publications have been published within this topic receiving 69137 citations.
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TL;DR: In this article, the properties of simple, self-consistent infall models which embed an "isothermal" dark halo in an open universe are presented, which depend on one scaling parameter and two shape parameters.
Abstract: The properties of simple, self-consistent infall models which embed an 'isothermal' dark halo in an open universe are presented. These models depend on one scaling parameter and two shape parameters. The first may be taken to be the circular velocity in the inner regions, and the others to be the density of the universe, Omega, and a measure, e, of the shape of orbits. These models provide a useful description of ensembles of satellite galaxies, or of binary galaxies, because they allow explicitly for the fact that such systems have orbital periods approaching the age of the universe and so cannot have a random orbital phase.
91 citations
TL;DR: In this article, the authors simulate the future evolution of the observed inhomogeneities in the local universe assuming that the global expansion rate is dominated by a cosmological constant, and they find that within two Hubble times (∼30 billion years) from the present epoch, large-scale structures will freeze in co-moving coordinates and the mass distribution of bound objects will stop evolving.
91 citations
TL;DR: In this article, the effects of nonlinearity, galaxy bias and redshift space distortions were investigated and the authors found that a survey of several Gpc 3 galaxies would constrain the sound horizon at z ǫ ∼ Ã 1 to about 1%.
91 citations
TL;DR: In this article, it was shown that the universe can experience many cycles with different vacua, which is a generic behavior independent of the details of the model and might provide a distinct dynamical approach to an anthropically favorable vacuum.
Abstract: Recently, the notion that the number of vacua is astronomical has received increased attentions, which may be regarded as a possible anthropical explanation to incredibly small cosmological constant. Further, a dynamical mechanism to implement this possibility is required. We show in an operable model of cyclic universe that the universe can experience many cycles with different vacua, which is a generic behavior independent of the details of the model. This might provide a distinct dynamical approach to an anthropically favorable vacuum.
89 citations
TL;DR: In this article, the authors studied the stability of the universe in the Ho-ifmmode with respect to a generalized version of the Sotiriou, Visser, and Weifurtner model.
Abstract: We study the stability of the Einstein static universe in the Ho\ifmmode \check{r}\else \v{r}\fi{}ava-Lifshitz (HL) gravity and a generalized version of it formulated by Sotiriou, Visser, and Weifurtner. We find that, for the HL cosmology, there exists a stable Einstein static state if the cosmological constant $\ensuremath{\Lambda}$ is negative. The universe can stay at this stable state eternally and thus the big bang singularity can be avoided. However, in this case, the Universe can not exit to an inflationary era. For the Sotiriou, Visser, and Weifurtner HL cosmology, if the cosmic scale factor satisfies certain conditions initially, the Universe can stay at the stable state past eternally and may undergo a series of infinite, nonsingular oscillations. Once the parameter of the equation of state $w$ approaches a critical value, the stable critical point coincides with the unstable one, and the Universe enters an inflationary era. Therefore, the big bang singularity can be avoided and a subsequent inflation can occur naturally.
88 citations