Topic
Particle horizon
About: Particle horizon is a research topic. Over the lifetime, 2096 publications have been published within this topic receiving 69137 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, a simple finite temperature λ 4 cosmological model was proposed to show that a new type singularity free cosmology model could be established by taking a series of important quantum and statistical effects into consideration such as spontaneous symmetry breaking, trace anomaly and particle creation, symmetry restoration at high temperature through phase transition and others.
Abstract: In this paper, we propose a simple finite temperature λ4 cosmological model to show that a new type singularity free cosmological model could be established by taking a series of important quantum and statistical effects into consideration such as spontaneous symmetry breaking, trace anomaly and particle creation, symmetry restoration at high temperature through phase transition and others. To begin with, the state of the universe would be a cold singu1arity free and horizon free Beltrami-Anti de Sitter one rather than a hot one. Then associated with the, particle creation, the temperature would, become higher and higher and as soon. as the temperature reached a critical value, Tc, a second-order phase transition would take place and the universe would transfer to a hot radiation dominated Friedmann state.
3 citations
01 Jan 2013
TL;DR: In this paper, the existence of a new subatomic particle called "fundamental particle" and the structure of primary formation matter remnants like dark matter, dark energy etc. are associated with the fundamental particle and their effect to the expansion of the universe is discussed.
Abstract: In this study, the existence of a new subatomic particle called “fundamental particle” and the structure of primary formation matter remnants like dark matter, dark energy etc. are associated with the structure of fundamental particle and their effect to the expansion of the universe is discussed. The size of this fundamental particle is calculated within some certain limit values. Based on the structure of fundamental particle, a new approach is shown to the expansion of the universe.
3 citations
TL;DR: In this paper, the early-time accelerated universe after the Big Bang was investigated and the dissipative properties of the inflationary universe in the presence of a soft type singularity, making use of the parameters of the generalized equation of the fluid.
Abstract: We investigate the early-time accelerated universe after the Big Bang. We pay attention to the dissipative properties of the inflationary universe in the presence of a soft type singularity, making use of the parameters of the generalized equation of state of the fluid. Flat Friedmann-Robertson-Walker metric is being used. We consider cosmological models leading to the so-called type IV singular inflation. Our obtained theoretical results are compared with observational data from the Planck satellite. The theoretical predictions for the spectral index turn out to be in agreement with the data, while for the scalar-to tensor ratio there are minor deviations.
3 citations
TL;DR: In this paper, the authors use Newtonian formalism to motivate the form of Friedmann equations that describe the expansion of the universe in the standard cosmological model and study the evolution of density perturbations in the universe.
Abstract: We use Newtonian formalism to motivate the form of Friedmann equations that describe the expansion of the universe in the standard cosmological model. We use the same formalism to study the evolution of density perturbations in the universe. We show that a simple model like spherical collapse can be used to estimate the characteristics of halos of galaxies and clusters of galaxies.
3 citations
TL;DR: In this article, the authors introduce an assumption that the universe is an actual subsystem of the infinite whole of reality, and analyze the consequences of introducing this assumption into the standard model of the universe, concluding that the Universe, with respect to its evolution, represents an ultrastable system consisting of a dynamic system of the 'de Sitter' evolution phase with the Planck values and of a 'Friedmann' phase of evolution into which the dynamics of its partial subsystems is incorporated.
Abstract: On the basis of the law of conservation of energy, the variations of radiation energy as a result of the variations of the dimensions of the Universe and of the increase in total energy of the hypothetical false vacuum, the author introduces an assumption that the Universe is an actual subsystem of the infinite whole of reality. Analyzing the consequences of introducing this assumption into the standard model of the Universe, he comes to the conclusion that the Universe, with respect to its evolution, represents an ultrastable system consisting of a dynamic system of the ‘de Sitter’ evolution phase with the Planck values and of a dynamic system of Friedmann's phase of evolution into which the dynamics of its partial subsystems is incorporated.
3 citations