Kalin Marinov | Searcharxiv

arXiv2016

Modeling of non-rotating neutron stars in minimal dilatonic gravity

The model of minimal dilatonic gravity (MDG), called also the massive Branse-Dicke model with $ω=0$, is an alternative model of gravitation, which uses one Branse-Dicke gravitation-dilaton field $Φ$ and offers a simultaneous explanation of the effects of dark energy (DE) and dark matter (DM). Here we present an extensive research of non-rotating neutron star models in MDG with four different realistic equations of state (EOS), which are in agreement with the latest observational data. The equations describing static spherically symmetric stars in MDG are solved numerically. The effects corresponding to DE and DM are clearly seen and discussed.

gr-qc↗

arXiv2015

Compact statis stars with polytropic equation of state in minimal dilatonic gravity

We present solution of the equations for relativistic static spherically symmetric stars (SSSS) in the model of minimal dilatonic gravity (MDG) using the polytropic equation of state. A polytropic equation of state, which has a good fitting with a more realistic one, is used. Results are obtained for all variables of a single neutron star in the model of MDG. The maximum mass about two solar masses is in accordance with the latest observations of pulsars. Several new effects are observed for the variables related with the dilaton $Φ$ and the cosmological constant $Λ$. The mass-radius relation is also obtained. Special attention is paid to the behavior of the quantities which describe the effects analogous to those of dark energy and dark matter in MDG. The results of the present paper confirm the conclusion that the dilaton $Φ$ is able to play simultaneously the role of dark energy and dark matter.

gr-qc↗