Year: 2015
Type: article
Abstract: We discuss neutron stars with strong magnetic mean fields in the framework of Extended Theories of Gravity. In particular, we take into account models derived from f ( R ) and f ( ) extensions of General Relativity where functions of the Ricci curvature invariant R and the Gauss-Bonnet invariant are respectively considered. Dense matter in magnetic mean field, generated by magnetic properties of particles, is described by assuming a model with three meson fields and baryons octet. As result, the considerable increasing of maximal mass of neutron stars can be achieved by cubic corrections in f ( R ) gravity. In principle, massive stars with M > 4 M ☉ can be obtained. On the other hand, stable stars with high strangeness fraction (with central densities ρ c ∼ 1.5–2.0 GeV/fm 3 ) are possible considering quadratic corrections of f ( ) gravity. The magnetic field strength in the star center is of order 6–8 × 10 18 G. In general, we can say that other branches of massive neutron stars are possible considering the extra pressure contributions coming from gravity extensions. Such a feature can constitute both a probe for alternative theories and a way out to address anomalous self-gravitating compact systems.
Institutions: Immanuel Kant Baltic Federal University, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Gran Sasso Science Institute, University of Naples Federico II, Tomsk State Pedagogical University, Institució Catalana de Recerca i Estudis Avançats, Institute of Space Sciences, Consejo Superior de Investigaciones Científicas, National Research Tomsk State University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Award: G2322070044
OpenAlex ID: W2135607260