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Neutron stars in Einstein-\(\Lambda\) gravity: the cosmological constant effects

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Abstract.

Regarding a d-dimensional spherically symmetric line element in the context of Einstein-\( \Lambda\) gravity, the hydrostatic equilibrium equation of stars is obtained. Then, by using the lowest-order constrained variational (LOCV) method with the AV18 potential and employing microscopic many-body calculations in the modern equation of state, the structure properties of neutron stars are investigated. Regardless of the cosmological point of view and considering arbitrary positive and negative values of the cosmological constant, the maximum mass of the neutron stars and their corresponding radius in 4 dimensions are computed. The results show that there is an upper limit for the maximum mass of a neutron star for a positive cosmological constant (\( M_{max} \leq 1.68M_{\odot}\)). On the other hand, it is shown that the Einstein gravity cannot explain the structure of neutron star with negative \( \Lambda\). Other properties of neutron stars such as the Schwarzschild radius, average density, compactness and Buchdahl-Bondi bound are studied. In addition, by using the Buchdahl-Bondi bound for neutron stars, stability of these stars is investigated. Finally, the dynamical stability is investigated and it is shown that the neutron stars follow the dynamical stability in this gravity.

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Authors and Affiliations

  1. Physics Department and Biruni Observatory, College of Sciences, Shiraz University, 71454, Shiraz, Iran

    G. H. Bordbar, S. H. Hendi & B. Eslam Panah

  2. Center for Excellence in Astronomy & Astrophysics of Iran (CEAAI-RIAAM) Maragha, P.O. Box: 55134-441, Maragha, Iran

    G. H. Bordbar

  3. Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), P.O. Box 55134-441, Maragha, Iran

    S. H. Hendi

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  1. G. H. Bordbar
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Bordbar, G.H., Hendi, S.H. & Eslam Panah, B. Neutron stars in Einstein-\(\Lambda\) gravity: the cosmological constant effects. Eur. Phys. J. Plus 131, 315 (2016). https://doi.org/10.1140/epjp/i2016-16315-0

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