Topic
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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01 Apr 1984
TL;DR: In this paper, the authors derived bounds on the admissible admixtures of other relic particles in the present universe and showed that weakly interacting particles with a mass in the range of 15-60 eV dominate the galaxy formation.
Abstract: Astronomical observational data on the large-scale structure of the Universe and on the distribution of hidden mass, interpreted within the framework of the adiabatic theory of galaxy formation, point to a dominance of weakly interacting particles with a mass in the range of 15--60 eV in the present Universe. Bounds are derived on the admissible admixtures of other relic particles.
6 citations
TL;DR: On the basis of the model properties of the expansive nondecelerative universe, present temperature of cosmic microwave background and specific entropy in the era of matter, the present parameters of our universe may be exactly determined as mentioned in this paper.
Abstract: On the basis of the model properties of the expansive nondecelerative universe, present temperature of cosmic microwave background and specific entropy in the era of matter, the present parameters of our Universe may be exactly determined.
6 citations
TL;DR: In this paper, the authors deal with the thermodynamics of the universe bounded by the event horizon and obtain the variation of entropy of the surface of the horizon from unified first law while matter entropy variation is calculated from the Gibbss' law.
Abstract: The work deals with the thermodynamics of the universe bounded by the event horizon. The matter in the universe has three constituents namely dark energy, dark matter and radiation in nature and interaction between then is assumed. The variation of entropy of the surface of the horizon is obtained from unified first law while matter entropy variation is calculated from the Gibbss’ law. Finally, validity of the generalized second law of thermodynamics is examined and conclusions are written point wise.
6 citations
TL;DR: In this paper, the authors investigated the late time acceleration of the universe in the context of the Stephani model and showed that the inhomogeneity of the models can lead to an accelerated evolution of universe that is analogous to that obtained with FLRW models through a cosmological constant or any exotic component for matter.
Abstract: We investigate the late time acceleration of the universe in the context of the Stephani model. This solution generalizes those of Friedmann–Lemaitre–Robertson–Walker (FLRW) in such a way that the spatial curvature is a function of time. We show that the inhomogeneity of the models can lead to an accelerated evolution of the universe that is analogous to that obtained with FLRW models through a cosmological constant or any exotic component for matter.
6 citations
TL;DR: In this paper, the authors explain how the universe was created out of "nothing", i.e., with no input of initial energy nor mass, and the inflationary phase, with exponential expansion, is accounted for, automatically, by their equation of state for the very early universe.
Abstract: We “explain”, using a Classical approach, how the Universe was created out of “nothing”, i.e., with no input of initial energy nor mass. The inflationary phase, with exponential expansion, is accounted for, automatically, by our equation of state for the very early Universe. This is a Universe with no-initial infinite singularity of energy density.
6 citations