Einstein equations give minimum and maximum limits of cosmic scale factor by considering pressure. The contraction before expansion is like the birth of a star. As in nuclear fusion stage, the temperature and pressure of the star depends on its mass, in the order of magnitude of universe mass fusion after gravitational contraction brings about […]
AbstractA new suggestive explanation of dark matter as an emerging phenomenon determined by the polarization of a three-dimensional quantum vacuum, i.e., by opportune quantum vacuum energy density fluctuations, associated with processes of manifestation/demanifestation of virtual pairs of particles-antiparticles, in a background characterized by a fluctuating viscosity, is proposed. It is shown that the observed flattening […]
AbstractIn the framework of fractional action cosmology, we have reconstructed the scalar potentials and scalar fields, namely, quintessence, phantom, tachyon, k-essence, Dirac-Born-Infeld-essence, hessence, dilaton field, and Yang-Mills field. To get more physical picture of the variation of the scalar field and potential with time, we express a scale factor in emergent, logamediate, and intermediate scenarios, […]
