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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 article, the authors studied the inflation in terms of the logarithmic entropy-corrected holographic dark energy (LECHDE) model with future event horizon, particle horizon, and Hubble horizon cut-offs.
Abstract: We study the inflation in terms of the logarithmic entropy-corrected holographic dark energy (LECHDE) model with future event horizon, particle horizon, and Hubble horizon cut-offs, and we compare the results with those obtained in the study of inflation by the holographic dark energy HDE model. In comparison, the spectrum of primordial scalar power spectrum in the LECHDE model becomes redder than the spectrum in the HDE model. Moreover, the consistency with the observational data in the LECHDE model of inflation constrains the reheating temperature and Hubble parameter by one parameter of holographic dark energy and two new parameters of logarithmic corrections.
2 citations
14 Jun 2007
TL;DR: In this article, the theory of universe dark energy was proposed and a solution of the cosmological constant problem was presented, based on geometric modeling of space-time as a perfect four-dimensional continuum cosmic fluid and the momentum generated by the time.
Abstract: This paper presents a basis of the theory of universe dark energy, a solution of Einstein's cosmological constant problem, physical interpretation of universe dark energy and Einstein's cosmological constant Lambda (=0.29447times10-52m-2), values of universe dark energy density (=1.2622times10-26kg/m3=6.8023 GeV), universe critical density (=1.8069times10-26kg/m3=9.7378 GeV), universe matter density (=0.54207times10-26 kg/m3=2.9213 GeV), and universe radiation density (=2.7103times10-31kg/m3=1.4558 MeV).The interpretation in this paper is based on geometric modeling of space-time as a perfect four-dimensional continuum cosmic fluid and the momentum generated by the time. In such a modeling, time is considered to have a mechanical nature so that the momentum associated with it is equal to the negative of the universe total energy. It is found that dark energy is a property of the space-time itself. Moreover, based on the fluidic nature of dark energy, the fourth law of thermodynamics is proposed, a new formulation and physical interpretation of Kepler's Three Laws are presented. Furthermore, based on the fact that what we are observing is just the history of our universe, on the Big Bang Theory, Einstein's General Relativity, Hubble Parameter, the estimated age of the universe, cosmic inflation theory and on NASA's observation of supernova la, then a second- order (parabolic) parametric model is obtained in this proposed paper to describe the accelerated expansion of the universe. This model shows that the universe is approaching the universe cosmic horizon line and will pass through a critical point that will influence significantly its fate. Considering the breaking symmetry model and the variational principle of mechanics, then the universe will witness an infinitesimally stationary state and a symmetry breaking. As result of that, a very massive impulse (Big Impulse of magnitude ~ 1033 x the linear momentum of the universe) will occur soon and, correspondingly, the universe will collapse. Finally, simulation results are demonstrated to verify the proposed models.
2 citations
01 Jan 1980
TL;DR: The single mode of gravitational radiation that activates the Taub model universe has the longest possible wavelength that will fit into that universe and an amplitude just sufficient to curve the geometry up into closure, via its "effective" content of mass energy, both kinetic and potential as mentioned in this paper.
Abstract: The single mode of gravitational radiation that activates the otherwise empty Taub model universe has the longest possible wavelength that will fit into that universe and an amplitude just sufficient to curve the geometry up into closure, via its “effective” content of mass energy, both kinetic and potential. A parameter m' of time asymmetry in the Taub family of models allows one to adjust the ratio kinetic/potential at the phase of time asymmetry. A sufficiently extreme value of this parameter, m' = 10 12 , gives a universe that will live as long as a typical Friedmann “dust-dominated” model (“stay”) = 60 × 19 9 years, but will have a volume-at-maximum expansion smaller by a factor of 4.8 × 10 10 , or a (“beam”) = [(π/2) (volume at maximum)] 1/3 that is smaller than that of the Friedmann model by a factor of 3.64 × 10 3 . If with a universe so small it is nevertheless possible to secure a stretch of time quite adequate for the development of life, it is not clear what is the point of a larger universe. Neither is it clear how the anthropic principle of Dicke and Carter is to come to terms with this “missed chance for economy.”
2 citations
09 Feb 2009
TL;DR: In this article, it was shown that the modulus of the total gravitational energy of a body is close to its rest energy E = mc 2, which is a remarkable result, and the smoothed gravitational potential in an arbitrary point of the observable universe appears close to −c 2, where
Abstract: The astronomical observations indicate that the universe expands with acceleration and it has a finite particle horizon. The recent CMB observations confirm the universe is homogeneous, isotropic and asymptotically flat. The total gravitational energy of a body having mass m is the gravitational potential energy originating from the gravitational interaction of the body with all masses of the observable universe, i.e. within the particle horizon. The flat geometry of the universe enables to determine the total gravitational energy of the mass m within the framework of the Newtonian gravity in Euclidean space. By this approach, it has been found the modulus of the total gravitational energy of a body is close to its rest energy E = mc 2 , which is a remarkable result. Besides, the smoothed gravitational potential in an arbitrary point of the observable universe appears close to −c 2 , where
2 citations
TL;DR: In this paper , the authors derived analytical approximation of the primordial power spectra and analyzed the CMB TT-spectra for the spatially closed emergent universe scenario, and compared the spectra of the emergent scenario with the ones of the ultraslow-roll inflationary model in the closed universe.
2 citations