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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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15 Jul 1999
TL;DR: The full-sky, high-resolution maps of the CMB that will be made in the next decade should determine cosmological parameters to unprecedented precision and sharply test inflation and other theories of the early Universe as discussed by the authors.
Abstract: The ten’s of micro-Kelvin variations in the temperature of the cosmic microwave background (CMB) radiation across the sky encode a wealth of information about the Universe. The full-sky, high-resolution maps of the CMB that will be made in the next decade should determine cosmological parameters to unprecedented precision and sharply test inflation and other theories of the early Universe.
1 citations
Journal Article•
TL;DR: In this paper, the authors investigated on string cosmological model universe coupled with electromagnetic field to study the evolution of the universe, it is found that such a model contains dark energy which implies that dark energy is there in the universe from the very beginning of its evolution when the particles exhibits in the form of strings.
Abstract: Here we have investigated on string cosmological model universe coupled with electromagnetic field to study the evolution of the universe, it is found that such a model contains dark energy which implies that dark energy is there in the universe from the very beginning of its evolution when the particles exhibits in the form of strings. Moreover there is possibility that dark energy dominated universe can contain in it highly contracted cosmic string. Using suitable physical assumptions for different cases, the field equations are solved exactly. The physical and kinematical features of the models and the effects of electromagnetic field with many novel and interesting consequences are revealed through this work and discussed in some details. Here the bulk viscosity and electromagnetic field are found to play great roles in the evolution of universe which will be beneficial in further research works.
1 citations
TL;DR: Godel's rotating-universe solution of Einstein's gravitational field equations is interpreted in real projective space and the compass of inertia is shown to coincide with the involuted geodesic of the closed manifold and predicts a cosmological redshift for distant events.
Abstract: Godel’s rotating-universe solution of Einstein’s gravitational field equations is interpreted in real projective space. The compass of inertia is shown to coincide with the involuted geodesic of the closed manifold and predicts a cosmological redshift for distant events. Other cosmological criteria of antimatter imbalance, the microwave background and nucleogenesis are satisfied in a natural way. The role of black holes in steady-state circulation, universal self-similar symmetry and the need to reinterpret astronomical data in hyperspace are discussed.
1 citations
Posted Content•
TL;DR: In this paper, a simple ''slow-fast'' type of the quintessence potential is designed for the closed universe to realize the present acceleration of our universe and its eventual big collapse.
Abstract: Whether our universe with present day acceleration can eventually collapse is very interesting problem. We are also interesting in such problems, whether the universe is closed? Why it is so flat? How long to expend a period for a cycle of the universe? In this paper a simple ``slow-fast'' type of the quintessence potential is designed for the closed universe to realize the present acceleration of our universe and its eventual big collapse. A detail numerical simulation of the universe evolution demonstrates that it divides the seven stages, a very rich story. It is unexpected that the quintessential kinetic energy is dominated in the shrink stage of the universe with very rapid velocity of the energy increasing. A complete analytic analysis is given for each stage. Some very interesting new problems brought by this collapse are discussed. Therefore our model avoids naturally the future event horizon problem of the present accelerative expanding universe and maybe realize the infinite cycles of the universe, which supplies a mechanism to use naturally the anthropic principle. This paper shows that the understanding on the essence of the cosmological constant should contain a richer content.
1 citations
01 May 2006
TL;DR: Kurucz as mentioned in this paper presented the results of gedanken experiments in a traditional linear, chronological sequence in the hope of stimulating research on the many topics considered in radiatively-driven cosmology.
Abstract: This is an updated version of my paper "An outline of radiatively-driven cosmology" (Kurucz 2000) Here the Big Bang universe is replaced by a finite cellular automaton universe with no expansion (Kurucz 2006) The Big Bang is replaced by many little bangs spread throughout the universe that interact to produce the initial perturbations that form Population III stars, globular clusters, and galaxies, but no large-scale structure These perturbations evolve into the universe as we now observe it Evolution during the first billion years is controlled by radiation Globular clusters are formed by radiatively-driven implosions, galaxies are formed by radiatively-triggered gravitational collapse of systems of globular clusters, and voids and the microwave background are formed by radiatively-driven expansion After this period most of the strong radiation sources are exhausted and the universe relaxes into gravitational old age as we know it To relieve the boredom we present the results of gedanken experiments (Kurucz 1992) in a traditional, linear, chronological sequence in the hope of stimulating research on the many topics considered
1 citations