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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 paper, the effects of the particles creation processes on the evolution of a spatially flat Friedmann-Lemaitre-Robertson-Walker (FLRW) universe are investigated.
Abstract: The effects of the particles creation processes on the evolution of a spatially flat Friedmann–Lemaitre–Robertson–Walker (FLRW) universe are investigated. Our approach is involved in the context of open thermodynamics systems choosing a natural phenomenological ansatz for the particles creation rate. There are reasons to believe that this model gives a simple and appropriate description of the gravitational stability concerning the isotropic model for the Early Universe considered both on a small and large scale. The prelude of our study is that the consideration of the particles production processes are supposed to play an relevant role in the perturbation theory arising in the Early Universe dynamics. We show how perturbations damp forwards in time or remain constant (as in the Cosmological Standard Model) and, differently from the standard analysis, we find instability backward in time from an initial condition on scalar perturbation.
Journal Article
TL;DR: Several versions of the pulsating (many-sheeted) model of the Universe are described in this paper, in particular a model with reversal of the arrow of time, and it is pointed out that the reversal point may be a singularity or may correspond to maximal cosmological expansion.
Abstract: Several versions of the pulsating (many-sheeted) model of the Universe are described, in particular, a model with reversal of the arrow of time. It is pointed out that the reversal point may be a singularity or may correspond to maximal cosmological expansion. The smoothing out of inhomogeneities and the growth of entropy produced by baryon decay are discussed, as well as processes involving black holes. It is conjectured that black holes are absent in the cosmological expansion-contraction cycle preceding the present one, and that such exceptional cycles do occur periodically.
Posted Content
TL;DR: In the standard model of universe the increase in mass of our observed expansive and isotropic relativistic universe is explained by the hypothetical assumption of matter objects emerging on the horizon (of the most remote visibility) as discussed by the authors.
Abstract: In the standard model of universe the increase in mass of our observed expansive and isotropic relativistic Universe is explained by the hypothetical assumption of matter objects emerging on the horizon (of the most remote visibility). However, the mathematical-physical analysis of the increase of Universe gauge factor shows that this hypothetical assumption is non-compatible with the variants of the standard model of universe by which - according to the standard model of universe - can be described the expansive evolution of the Universe.
01 Jan 2011
TL;DR: Bianchi type-III inflationary universe in the presence of mass less scalar field with a flat potential is investigated in this paper, where physical and kinematical properties of the universe are also discussed.
Abstract: Bianchi type-III inflationary universe is investigated in the presence of mass less scalar field with a flat potential. To get an inflationary universe a flat region in which potential V is constant is considered. Some physical and kinematical properties of the universe are also discussed.
Journal ArticleDOI
TL;DR: In this paper, the mass squared corrections for a universe dominated by inflatonic non-topological solitons were revisited and shown to be equivalent to the case c = 0 of a homogeneous universe.
Abstract: In running mass inflation and hybrid inflation models it is possible that the inflaton field will fragment into non-topological solitons, resulting in a highly inhomogeneous post-inflation era prior to reheating. In supersymmetric models with a conventional homogeneous post-inflation era, the dynamics of flat direction scalars are determined by cH2 corrections to the mass squared terms (where ), coming from F-terms in the early universe combined with Planck-scale suppressed interactions. Here we reconsider the mass squared corrections for a universe dominated by inflatonic non-topological solitons. We show that in this case the dynamics of a coherently oscillating flat direction scalar are typically the same as for the case where there is no significant mass squared correction, even in the vicinity of the non-topological solitons. Therefore the dynamics of flat direction scalars in a universe dominated by inflatonic non-topological solitons are equivalent to the case c = 0 of a homogeneous universe.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202320
202247
20216
202010
201910
201814