GRAVITY-DRIVEN ACCELERATION AND KINETIC INFLATION IN NONCOMMUTATIVE BRANS-DICKE SETTING
Journal Title: Odessa Astronomical Publications - Year 2016, Vol 29, Issue
Abstract
By assuming the spatially flat FLRW line-element and employing the Hamiltonian formalism, a noncommutative (NC) setting of the Brans-Dicke (BD) theory is introduced. We investigate gravity-driven acceleration and kinetic inflation in this NC BD cosmology. Despite to the commutative case, in which both the scale factor and BD scalar field are obtained in power-law forms (in terms of the cosmic time), in our herein NC model, we see that the power-law scalar factor is multiplied by a dynamical exponential warp factor. This warp factor depends on not only the noncommutative parameter but also the momentum conjugate associated to the BD scalar field. For very small values of this parameter, we obtain an appropriate inflationary solution, which can overcome problems within standard BD cosmology in a more efficient manner. Moreover, we see that a graceful exit from an early acceleration epoch towards a decelerating radiation epoch is provided. For late times, due to the presence of the NC parameter, we obtain a zero acceleration epoch, which can be interpreted as the coarse-grained explanation.
Authors and Affiliations
S. M. M. Rasouli, Paulo Vargas Moniz
Keywords
Related Articles
- EP ID EP374454
- DOI 10.18524/1810-4215.2016.29.84956
- Views 92
- Downloads 0
CONDENSATION OF COLD NEUTRONS – IDEA OF G.A.GAMOW. CHEMICAL PROPERTIES OF THE NEUTRON MATTER AND ITS PLACE IN THE PERIODIC SYSTEM OF ELEMENTS
Today, the neutron matter and neutron stars are already substantially rooted in the nuclear physics and astrophysics, and it is logical to have their consideration of them in terms of chemical properties and principles o...
Positron Annihilation Spectroscopy of Young Supernova Remnants
This paper discusses radiative and thermodynamic properties of cold rarefied aggregates of non-uniformly distributed gas and dust through which high fluxes of positrons with energies of 0.011-3.6 MeV pass. The investigat...
ESTIMATIONS OF LOCAL MAGNETIC FIELDS IN SOLAR FLARES: BASIC METHODS AND SOME RESULTS
We consider three methods for estimations of local magnetic fields in solar flares: (1) analysis of bisectors of I ± V profiles (Lozitsky, 2015); (2) search for Zeeman-like effects in cores of spectral lines with very...
ALGORITHMS OF MULTI FREQUENCY RADIOMETRY IN THE CONDITIONS OF BROADBAND INTERFERENCE
The development of digital technologies for multi-frequency signal reception in the low-frequency range creates the prerequisites for the application of optimal algorithms for real-time beamforming without changing the a...
THE DECADE-LONG INSTABILITIES IN EARTH’S ROTATION AS EVIDENCE OF LITHOSPHERIC DRIFT OVER THE ASTENOSPHERE
The decade instabilities in Earth’s rotation (DIER) are usually explained by the interactions of the Earth’s core and mantle. This hypothesis explains well a close correlation between DIER and the variations in the rate...