Extreme neutron stars from Extended Theories of Gravity

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 $f(\mathcal{G})$ extensions of General Relativity where functions of the Ricci curvature invariant $R$ and the Gauss-Bonnet invariant $\mathcal{G}$ 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 $M>4M_{\odot }$ can be obtained. On the other hand, stable stars with high strangeness fraction (with central densities ${\rho }_c\sim 1.5-2.0$ GeV/fm${}^3$) are possible considering quadratic corrections of $f(\mathcal{G})$ gravity. The magnetic field strength in the star center is of order $6-8\times 10^{18}$ 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.

12 pages, 2 figures, to be published in JCAP

References in corpus (28)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Beyond the Cosmological Standard Model
• Dark energy in modified Gauss-Bonnet gravity: late-time acceleration and the hierarchy problem
• Dark energy cosmology from higher-order, string-inspired gravity and its reconstruction
• Future of the universe in modified gravitational theories: Approaching to the finite-time future singularity
• String-inspired Gauss-Bonnet gravity reconstructed from the universe expansion history and yielding the transition from matter dominance to dark energy
• The Cosmology of Modified Gauss-Bonnet Gravity
• Hydrostatic equilibrium and stellar structure in f(R)-gravity
• Phantom scalar dark energy as modified gravity: understanding the origin of the Big Rip singularity
• Eight New Millisecond Pulsars in NGC 6440 and NGC 6441
• Relativistic stars in f(R) gravity, and absence thereof
• Hypernuclear Physics for Neutron Stars
• Cold uniform matter and neutron stars in the quark-mesons-coupling model
• Slowly rotating neutron and strange stars in $R^2$ gravity
• Time-dependent matter instability and star singularity in $F(R)$ gravity
• The existence of relativistic stars in f(R) gravity
• Stability of the Einstein static universe in modified Gauss-Bonnet gravity
• On the co-existence of matter dominated and accelerating solutions in f(G)-gravity
• Tracking quintessence by cosmic shear - Constraints from VIRMOS-Descart and CFHTLS and future prospects
• Perturbative aspects and conformal solutions of F(R) gravity
• Tolman-Oppenheimer-Volkoff Equations in Modified Gauss-Bonnet Gravity
• Cosmological entropy and generalized second law of thermodynamics in $F(R,G)$ theory of gravity
• Jeans Instability in Classical and Modified Gravity
• Constraints on 3-3-1 models with electroweak Z pole observables and Z' search at LHC
• QED Actions in Supercritical Fields
• Equation of state for neutron stars: Hyperon mixing in SU(3) flavor symmetry

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• Stability of Relativistic Spheres Powered by Energy Profile in Einstein Gauss-Bonnet Gravity
• Spacetime Curvature as a Probe of Exotic Core Phases in Neutron Stars within Modified Gravity
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