ﻻ يوجد ملخص باللغة العربية
Einsteins static model is the first relativistic cosmological model. The model is static, finite and of spherical spatial symmetry. I use the solution of Einsteins field equations in a homogeneous and isotropic universe -- Friedmanns equation -- to calculate the radius of curvature of the model (also known as Einsteins universe). Furthermore, I show, using a Newtonian analogy, the models mostly known feature, namely, its instability under small perturbations on the state of equilibrium.
We consider a cosmology in which the final stage of the Universe is neither accelerating nor decelerating, but approaches an asymptotic state where the scale factor becomes a constant value. In order to achieve this, we first bring in a scale factor
This work presents a complete cyclic cosmological scenario based on nonlinear magnetic field. It is constructed a model composed by five fluids namely baryonic matter, dark matter, radiation, neutrinos and a cosmological magnetic field. The first fou
The Hubble law, determined from the distance modulii and redshifts of galaxies, for the past 80 years, has been used as strong evidence for an expanding universe. This claim is reviewed in light of the claimed lack of necessary evidence for time dila
In this paper, we discuss that an observable-based single-system Copenhagen and entanglement-based two-system von Neumann measurement protocols in quantum theory can be made equivalent by considering the second part of the two-system scheme to be a D
From the observed results of the space distribution of quasars we deduced that neutrino mass is about 10^(-1) eV. The fourth stable elementary particle (delta particle) with mass about 10^(0) eV can help explain the energy resource mechanism in quasa