Modeling of non-rotating neutron stars in minimal dilatonic gravity
- 71 Downloads
The model of minimal dilatonic gravity (MDG), called also the massive Branse-Dicke model with \(\omega =0\), is an alternative model of gravitation, which uses one Branse-Dicke gravitation-dilaton field \(\varPhi \) 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.
KeywordsExtended gravity Neutron star Gravitational dilaton Equation of state
Kalin Marinov wants to express gratitude to the “Program for career development of young scientists, Bulgarian Academy of Sciences” project “Extended theories of gravity and their application to physics of compact stars” N0 DFNP-51/21.04.2016. Plamen Fiziev is deeply indebted to the Directorate of the Laboratory of Theoretical Physics, JINR, Dubna, for the good working conditions and support.
He also owes gratitude to Alexei Starobinsky, Salvatore Capozziello, Sergei Odintsov, Mariafelicia De Laurentis, Alexander Zacharov, Luciano Rezzolla, Valeria Ferrari, Pawel Haensel, Alexander Potekhin and Fiorella Burgio for the stimulating discussions on different topics of the present publication.
Special thanks to Kazim Yavuz Ekşi for providing the numerical EOS data.
The authors are thankful to the unknown referee for the useful comments of the initial version o the paper. Especially, the present new Sect. 4 is our answer to the question raised by the referee.
This research was supported in part by the Foundation for Theoretical and Computational Physics and Astrophysics and by Bulgarian Nuclear Regulatory Agency Grants for 2014, 2015 and 2016 as well as by “NewCompStar”, COST Action MP 1304.
- Antoniadis, J., Freire, P.C.C., Wex, N., Tauris, T.M., Lynch, R.S., van Kerkwijk, M.H., Kramer, M., Bassa, C., Dhillon, V.S., Driebe, T., Hessels, J.W.T., Kaspi, V.M., Kondratiev, V.I., Langer, N., Marsh, T.R., McLaughlin, M.A., Pennucci, T.T., Ransom, S.M., Stairs, I.H., van Leeuwen, J., Verbiest, J.P.W., Whelan, D.G.: Science 340, 6131 (2013). doi: 10.1126/science.1233232 ADSCrossRefGoogle Scholar
- Capozziello, S., Faraoni, V.: Beyond Einstein Gravity. In: Fundamental Theories of Physics, vol. 170. Springer, Berlin (2011) Google Scholar
- Fiziev, P.: Preprint UTTG-02-02 gr-qc/0202074v4 (2002)
- Fiziev, P.: Eprint, arXiv:1402.2813 [gr-qc] (2014a)
- Fiziev, P.: Eprint, arXiv:1411.0242 [gr-qc] (2014b)
- Fiziev, P.: Eprint, arXiv:1506.08585 [gr-qc] (2015a)
- Fiziev, P.: Eprint, arXiv:1512.03931 [gr-qc] (2015b)
- Fiziev, P., Marinov, K.: Bulg. Astron. J. 23, 3 (2015) Google Scholar
- O’Hanlon, J.: Phys. Rev. Lett. 82, 451 (1972) Google Scholar
- Potekhin, A.Y., Fantina, A.F., Chamel, N., Pearson, J.M., Goriely, S.: Astron. Astrophys., vol. 560, p. A48 (2013) Google Scholar