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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, it is shown that cosmological models based on self-interacting scalar field theory or on the theory of the chiral non-linear sigma model can describe the global evolution of the universe, extending from an inflationary stage to the present time epoch.
Abstract: It is shown that cosmological models, based on the self-interacting scalar field theory or on the theory of the chiral non-linear sigma model. Can describe the global evolution of the Universe, extending from an inflationary stage to the present time epoch. The method of cosmological perturbations decomposition for inflaton and non-inflaton ones is applied for two-component chiral cosmological model in the spatially flat Friedmann-Robertson-Walker (FRW) Universe. New non-inflaton mode of cosmological perturbations is found.
6 citations
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TL;DR: In this article, the authors discuss the potential cosmological role of gravitational wave astronomy as a probe of the very early universe and discuss the next generation of detectors that may be able to observe a stochastic background of gravitational waves produced by violent processes during the earliest moments after the creation of the universe.
Abstract: We discuss the potential cosmological role of gravitational wave astronomy as a probe of the very early universe. The next generation of detectors - now in production - may be able to observe a stochastic background of gravitational waves produced by violent processes during the earliest moments after the creation of the universe. Viable theoretical scenarios within detector sensitivity include strongly first-order phase transitions, possibly at the end of inflation, and networks of cosmic strings. At this stage, other primordial backgrounds from slow-roll inflation, global topological defects and the standard electroweak phase transition appear to be out of range. The discovery of any of the possible cosmological sources will have enormous implications for our understanding of the very early universe and for fundamental physics at the highest energies.
6 citations
TL;DR: In this paper, the evolution of superheated particles in the Friedmann universe is considered under the assumption of the asymptotic behavior of the scattering cross sections in the high-energy region.
Abstract: The evolution of superheated particles in the Friedmann universe is considered under the assumption of the asymptotic behavior of the scattering cross sections in the high-energy region. We show that there is no local thermodynamic equilibrium at early stages and conclude that the nature of cosmic rays can be explained on cosmological grounds.
6 citations
TL;DR: In this article, it was shown that the set of initial conditions for spontaneous homogenization of cosmological models can form a set of non-zero measure, which is not the case in this paper.
Abstract: The present-day Universe appears to be homogeneous on very large scales. Yet when the casual structure of the early Universe is considered, it becomes apparent that the early Universe must have been highly inhomogeneous. The current paradigm attempts to answer this problem by postulating the inflation mechanism However, inflation in order to start requires a homogeneous patch of at least the horizon size. This paper examines if dynamical processes of the early Universe could lead to homogenization. In the past similar studies seem to imply that the set of initial conditions that leads to homogenization is of measure zero. This essay proves contrary: a set of initial conditions for spontaneous homogenization of cosmological models can form a set of non-zero measure.
6 citations
TL;DR: In this article, the age of the observable universe was found to be 11 billion years using radioactive chronometers and the inflationary model was shown to be substantially correct in this case, since 11/17 = 0.647 is in close accord with 2/3=0.667.
Abstract: The inflationary model for the inhomogeneous universe predicts that the age of the universe is exactly two-thirds of the Hubble time, the inverse of the Hubble constant. In this paper the Hubble time is taken to be 17 billion years from red-shift measurements and the age of the observable universe is found to be 11 billion years using radioactive chronometers. Since 11/17=0.647 is in close accord with 2/3=0.667, the inflationary model calculations can be taken as substantially correct in this case.
6 citations