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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, a study of the accelerated expansion problem of the large scale universe is presented, where Friedmann-like equations describing the background dynamics of the recent universe are derived.
Abstract: In this paper a study of the accelerated expansion problem of the large scale universe is presented. To derive Friedmann like equations, describing the background dynamics of the recent universe we take into account, that it is possibile to interpret the spacetime dynamics as an emergent phenomenon. It is a consequence of the deep study of connection between gravitation and thermodynamics. Considered models are based on phenomenological modifications of the horizon temperature. In general, there are various reasons to modify the horizon temperature and one of them can be related to the feedback from the spacetime on the horizon, which will generate additional heat. In order to constraint the parameters of the models we use $Om$ analysis and the constraints on this parameter at $z=0.0$, $z=0,57$ and $z=2.34$.

1 citations

Posted Content
TL;DR: In this article, the equations that govern the dynamics of the universe in the modified unimodular theory of gravity are derived and a mechanism for inflation in the early universe without postulating a false vacuum state during the first $10−35}$ seconds after the Big Bang is presented.
Abstract: The equations that govern the dynamics of the universe in the modified unimodular theory of gravity are derived. We find a mechanism for inflation in the early universe without postulating a false vacuum state during the first $10^{-35}$ seconds after the Big Bang. In addition, we find a natural explanation for the acceleration of the universe without resorting to dark energy.

1 citations

Posted Content
TL;DR: In this article, the results of [0810.2831] are extended to show that tree-approximation correlation functions of Heisenberg picture operators for the reduced spatial metric are constant outside the horizon during local thermal equilibrium with no non-zero conserved quantum numbers.
Abstract: Making a connection between observations of cosmological correlation functions and those calculated from theories of the early universe requires that these quantities are conserved through the periods of the universe which we do not understand. In this paper, the results of [0810.2831] are extended to show that tree-approximation correlation functions of Heisenberg picture operators for the reduced spatial metric are constant outside the horizon during local thermal equilibrium with no non-zero conserved quantum numbers.

1 citations

Posted Content
TL;DR: In this paper, the authors considered the model of the universe which describes the above properties and considered the galaxy number counts as an evidence of that the geometry of universe is euclidean and that K-corrections are absent.
Abstract: Having based on the analysis of Pietronero and collaborators the galaxy number counts can be considered as an evidence of that the geometry of the universe is euclidean and that the K-corrections are absent. In such a universe measuring the cosmological redshift of the object and measuring the flux from the object are inconsistent. It is considered the model of the universe which describes the above properties.

1 citations

Posted Content
TL;DR: In this article, the authors consider a model of the universe based on the equation of state (p = 1/3)-rho (c/F)^2, where F is the scale factor.
Abstract: We consider a model of the Universe based on the equation of state $p=(1/3)\rho (c/F)^2$, where $F$ is the scale factor. This model behaves as an inflationary Universe from the beginning and during its early stages, and behaves as dust matter during the stages of maximum expansion.

1 citations


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